2018/
2017/16/15/14/13/12/11/10
2009/08 /07 /06 /05 /04 /03 /02 /01 /00
1999 /98 /97 /96 /95 /94 /93 /92 /91 /90 /89 /88
M. Zocher, Ch. Heyn, W. Hansen "Droplet etching with indium- Intermixing and lattice mismatch" , J. Cryst. Growth 512, 219 (2019). [https://doi.org/10.1016/j.jcrysgro.2019.02.030]
Ch. Heyn, A. Küster, M. Zocher, and W. Hansen, "Field-Controlled Quantum Dot to Ring Transformation in Wave-Function Tunable Cone-Shell Quantum Structures", Phys. Status Solidi 13, RRL, 1800245 (2019). [https://doi.org/10.1002/pssr.201800245]
2018
V. Vonk, T. Slobodskyy, 2 Thomas F. Keller, M.-I. Richard, Sara Fernández, Tobias Schulli, Ch. Heyn, W. Hansen, and A. Stierle "Faceting of local droplet-etched nanoholes in AlGaAs", Phys. Rev. Materials 2,106001 (2018). [https://link.aps.org/doi/10.1103/PhysRevMaterials.2.106001]
Christian Heyn, Michael Zocher, Wolfgang Hansen, "Functionalization of droplet etching for quantum rings", in: "Physics of Quantum Rings, 2nd Edition", Editor Vladimir Fomin, Springer Series: NanoScience and Technology, (2018). [https://www.springer.com/us/book/9783319951584]
Ch. Heyn, M. Zocher, A. Küster, and W. Hansen, "Droplet Etching during Semiconductor Epitaxy for Single and Coupled Quantum Structures", Proc. SPIE 10543:105430K. International Society for Optics and Photonics (2018). [https://doi.org/10.1117/12.2295829]
S. Buchenau, L. O. Akinsinde, M. Zocher, D. Rukser, U. Schürmann, L. Kienzle, B. Grimm-Lebsanft , and M. Rübhausen, "Scalable polyol synthesis for few quintuple layer thin and ultra high aspect ratio Bi2Se3 structures", Solid State Comm. 281, 49-52 (2018). [https://doi.org/1.1016/j.ssc.2018.07.003]
A. Koitmäe, M. Müller, C. S. Bausch, J. Harberts, W. Hansen, G. Loers, and R. H. Blick "Designer Neural Networks with Embedded Semiconductor Microtube Arrays", Langmuir 34, 1528 (2018). [https://pubs.acs.org/doi/pdf/10.1021/acs.langmuir.7b03311]
Ch. Heyn, A. Küster, A. Gräfenstein, A. Ungeheuer, A. Graf, W. Hansen, "GaAs quantum dot molecules filled into droplet etched nanoholes", J. Cryst. Growth 477, 235 (2017). DOI: 10.1016/j.jcrysgro.2017.03.029
Ch. Heyn, A. Küster, A. Ungeheuer, A. Grafenstein, and W. Hansen, "Excited-state indirect excitons in GaAs quantum dot molecules", Phys. Rev. B 96, 085408 (2017). DOI: 10.1103/PhysRevB.96.085408
R. Tholapi, I.A. Karateev, B.S. Roshchin, V.E. Asadchikov, T. Slobodskyy, W. Hansen, and A.L. Vasiliev, "Interface matching and intermixing of thin MgO barriers and ferromagnetic layers deposited on GaAs (001)", J. Applied Physics, 121, 205308 (2017). [doi: http://dx.doi.org/10.1063/1.4984754]
L.-K. Liefeith, R. Tholapi, T. Ishikura, M. Hänze, R. Hartmann, T. Slobodskyy, and W. Hansen,"Spin injection beyond the diffusive limit in the presence of spin-orbit coupling", Phys. Rev. B, 95, 081303(R) (2017). DOI: 10.1103/PhysRevB.95.081303
Ch. Heyn, M. Zocher, L. Pudewill, H. Runge, A. Küster, and W. Hansen, "Droplet etched GaAs quantum dots close to surfaces and metallic interfaces ", J. Applied Physics, 121, 044306 (2017). DOI: 10.1063/1.4974965
A. Koitmäe, J. Harberts, G. Loers, M. Müller, C. Bausch, D. Sonnenberg, Ch. Heyn, R. Zierold, W. Hansen, and R. H. Blick, "Approaching Integrated Hybrid Neural Circuits: Axon Guiding on Optically Active Semiconductor Microtube Arrays", Advanced Materials Interfaces, 3, 1600746 (2016). DOI: 10.1002/admi.201670117
Ch. Heyn, M. Zocher, S. Schnüll, and W. Hansen, "Role of Arsenic During Aluminum Droplet Etching of Nanoholes in AlGaAs", Nanoscale Research Letters, 11, 428 (2016). doi: 10.1186/s11671-016-1648-6
R. Tholapi, L. Liefeith, G. Ekindorf, K. Perumal, T. Slobodskyy, and W. Hansen, "Effect of low-temperature post-growth annealing on anisotropic strain in epitaxial Fe layers deposited on GaAs(001)", J. Appl. Phys. 119, 245304 (2016). doi: 10.1063/1.4954872
A. Küster, C. Heyn, A. Ungeheuer, G. Juska, S. Tommaso Moroni, E. Pelucchi, and W. Hansen, "Droplet etching of deep nanoholes for filling with self-aligned complex quantum structures", Nanoscale Research Letters, 11, 282 (2016). doi: 10.1186/s11671-016-1495-5
L.-K. Liefeith, R. Tholapi, M. Hänze, R. Hartmann, T. Slobodskyy, and W. Hansen, "Influence of thermal annealing on the spin injection and spin detection through Fe/GaAs interfaces", App. Phys. Lett. 108, 212404 (2016). doi: 10.1063/1.4952389
H. Thierschmann, F. Arnold, M. Mittermüller, L. Maier, Ch. Heyn, W. Hansen, H. Buhmann, and L. W. Molenkamp, "Thermal control and generation of charge currents in coupled quantum dots", Phys. Status Solidi A, 213, 582 (2016). doi: 10.1002/pssa.201532608
D. Grigoriev, S. Lazarev, P. Schroth, A. A. Minkevich, M. Köhl, T. Slobodskyy, M. Helfrich, D. M. Schaadt, T. Aschenbrenner, D. Hommel and T. Baumbach, "Asymmetric skew X-ray diffraction at fixed incidence angle: application to semiconductor nano-objects", Journal of Applied Crystallography 49, 961 (2016). doi: 10.1107/S1600576716006385
J.N.Toedt, S. Mansfeld, D. Mellem, W. Hansen, D. Heitmann, und S. Mendach, "Interface modes at step edges of media with anisotropic dispersion", Phys. Rev. B, 93, 184416 (2016). doi: 10.1103/PhysRevB.93.184416
F. Herzog, S. Heedt, S. Goerke, A. Ibrahim, B. Rupprecht, Ch. Heyn, H. Hardtdegen, T. Schapers, M.A. Wilde, and D. Grundler, "Confinement and inhomogeneous broadening effects in the quantum oscillatory magnetization of quantum dot ensembles", J. Phys.: Condens. Matter, 28, 045301 (2016). doi: 10.1088/0953-8984/28/4/045301
H. Thierschmann, F. Arnold, M. Mittermüller, L. Maier, C.Heyn, W. Hansen, H. Buhmann, and L.W. Molenkamp, '"Thermal gating of charge currents with Coulomb coupled quantum dots", New Journal of Physics 17, 113003 (2015). https://iopscience.iop.org/article/10.1088/1367-2630/17/11/113003
Ch. Heyn and D.E. Jesson, "Congruent Evaporation Temperature of Molecular Beam Epitaxy Grown GaAs (001) Determined by Local Droplet Etching", Applied Physics Letters, 107, 161601 (2015). doi: 10.1063/1.4934218
H. Thierschmann, R. Sánchez, B. Sothmann, F. Arnold, Ch. Heyn, W. Hansen, H. Buhmann, and L. W. Molenkamp, "Three-terminal energy harvester with coupled quantum dots", Nature Nanotech., 10, 854 2015). doi:10.1038/nnano.2015.176
F. Herzog, Ch. Heyn, H. Hardtdegen, T. Schäpers, M. A. Wilde, and D. Grundler, "Micromechanical measurement of beating patterns in the quantum oscillatory chemical potential of InGaAs quantum wells due to spin-orbit coupling", Applied Physics Letters, 107, 092101 (2015). doi: 10.1063/1.4929840
M. Pakmehr, B. D. McCombe, O. Chiatti, S. F. Fischer, Ch. Heyn, and W. Hansen, "Characterization of High Mobility InAs/InGaAs/InAlAs Composite Channels by THz Magneto-Photoresponse Spectroscopy", Int. J. of High Speed Electronics and Systems 24, 1520004 (2015). doi: 10.1142/S0129156415200049
T. Slobodskyy, A.V. Zozulya, R. Tholapi, L. Liefeith, M. Fester, M. Sprung, and W. Hansen, "Versatile atomic force microscopy setup combined with micro-focused X-ray beam", Rev. Sci. Instrum. 86, 065104 (2015). doi:10.1063/1.4922605
S. Wolski, C. Jasiukiewicz, V.K. Dugaev, J. Barnas, B. Landgraf, T. Slobodskyy, and W. Hansen, "Charge and Spin Transport in a Metal-Semiconductor Heterostructure with Double Schottky Barriers", Acta Physica Polonica A 127, 472 (2015). doi: 10.12693/APhysPolA.127.472
Ch. Heyn, Th. Bartsch, S. Sanguinetti, D.E. Jesson, and W. Hansen, "Dynamics of mass transport during nanohole drilling by local droplet etching", Nanoscale Research Letters 10, 67 (2015). doi:10.1186/s11671-015-0779-5
O. Chiatti, S. S. Buchholz, Ch. Heyn, W. Hansen, M. Pakmehr, B. D. McCombe, and S. F. Fischer, "Electrical and terahertz magnetospectroscopy studies of laser-patterned AQ1 2 micro- and nanostructures on InAs-based heterostructures", Applied Physics Letters, 106, 052102 (2015). doi: 10.1063/1.4907571
M. Pakmehr, A. Khaetskii, B. D. McCombe, O. Chiatti, S. F. Fischer, Ch. Heyn, and W. Hansen, "THz Magneto-Photoresponse Spectroscopy of Two-Dimensional Electrons in an InAs/InGaAs/InAlAs Inserted-Channel", Journal of Infrared, Millimeter, and Terahertz Waves 46, 291 (2015). doi: 10.1007/s10762-014-0126-4
Th. Bartsch, Ch. Heyn, and W. Hansen, "Electronic Transport through Conical Nanosized GaAs Pillars", MRS Proceedings 1735 (2015). doi: dx.doi.org/10.1557/opl.2015.290
S. Wolski, T. Szczepanski, V.K. Dugaev, J. Barnas, B. Landgraf, T. Slobodskyy, and W. Hansen, "Spin and charge transport in double-junction Fe/MgO/GaAs/MgO/Fe heterostructures", J. Appl. Phys. 117, 043908 (2015). doi: 10.1063/1.4906397
H. Lehmann, T. Benter, I. von Ahnen, J. Jacob, T. Matsuyama, U. Merkt, U. Kunze, A. D. Wieck, D. Reuter, Ch. Heyn, and W. Hansen, "Spin-resolved conductance quantization in InAs", Semicond. Sci. Technol., 29, 075010, Juli (2014). doi: 10.1088/0268-1242/29/7/075010
Ch. Heyn, S. Schnüll, D. E. Jesson, and W. Hansen, "Thermally controlled widening of droplet etched nanoholes", Nanoscale Research Letters 9, 285 (2014). doi: 10.1186/1556-276X-9-285
A. Zozulya, T. Slobodskyy, Th. Bartsch, A. Wetzel, D. Sonnenberg, Ch. Heyn, M. Sprung, W. Hansen, "Embedded GaAs nanopillars studied by high resolution reciprocal space mapping and SEM", Phys. stat. sol. (a) 211,1319 (2014). doi: 10.1002/pssa.201300200
D. Sonnenberg, A. Küster, A. Graf, C. Heyn, and W. Hansen, "Vertically stacked quantum dot pairs fabricated by nanohole filling", Nanotechnology 25, 215602 (2014). doi: 10.1088/0957-4484/25/21/215602
M. Brasse, S. M. Sauther, J. Falson, Y. Kozuka, A. Tsukazaki, C. Heyn, M. A. Wilde, M. Kawasaki, and D. Grundler, "Enhanced quantum oscillatory magnetization and nonequilibrium currents in an interacting two-dimensional electron system in MgZnO/ZnO with repulsive scatterers", Phys. Rev. B 89, 075307 (2014). doi: 10.1103/PhysRevB.89.075307
A. Graf, D. Sonnenberg, V. Paulava, A. Schliwa, Ch. Heyn, and W. Hansen, "Excitonic States in GaAs Quantum Dots Fabricated By Local Droplet Etching", Phys. Rev. B 89, 115314 (2014). doi: 10.1103/PhysRevB.89.115314
J. Kerbst, Ch. Heyn, T. Slobodskyy, and W. Hansen, "Density Limits of High Temperature- and Multiple Local Droplet Etching on AlAs", Journal of Crystal Growth 389, 18 (2014). doi: 10.1016/j.jcrysgro.2013.11.044
Th. Bartsch, D. Sonnenberg, Ch. Strelow, Ch. Heyn, und W. Hansen, "Electric Properties of Semiconductor Nanopillars", Journal of Electronic Materials 43, 1972 (2014). doi: 10.1007/s11664-013-2929-9
Ch. Heyn, S. Schnüll, and W. Hansen,"Scaling of the structural characteristics of nanoholes created by local droplet etching", J. Applied Physics 115, 024309 (2014). doi: 10.1063/1.4861722
Ch. Heyn, D. Sonnenberg, A. Graf, J. Kerbst, A. Stemmann, and W. Hansen, "Local Droplet Etching - Nanoholes, Quantum Dots, and Air-Gap Heterostructures", AIP Conference Proceedings, 1598, 91-94, (2014).
H. Thierschmann, M. Henke, J. Knorr, L. Maier, C. Heyn, W. Hansen, H. Buhmann, and L. M. Molenkamp,"Diffusion thermopower of a serial double quantum dot", New Journal of Physics 15, 123010 (2013). doi:10.1088/1367-2630/15/12/123010
D. Mellem, J.-N. Toed, F. Balhorn, S. Mansfeld, W. Hansen, and S. Mendach,"Optically Measured Spin-Wave Mode-Spectrum in Rolled-up Permalloy Film with Time-Resolved Scanning-Kerr-Microscopy", Spin 03, 1340007 (2013). doi: 10.1142/S2010324713400079
C. S. Bausch, A. Koitmäe, E. Stava, A. Price, P. J. Resto, Y. Huang, D. Sonnenberg, Y. Stark, C. Heyn, J. C. Williams, E. W. Dent, and R. H. Blick, "Guided Neuronal Growth on Arrays of Bio-Functionalized GaAs/InGaAs Semiconductor Microtubes", Applied Physics Letters 103, 173705 (2013). doi: 10.1063/1.4826885
D. Sonnenberg, A. Graf, V. Paulava, Ch. Heyn, and W. Hansen, "High excitation power photoluminescence studies of ultra-low density GaAs quantum dots", AIP Conference Proceedings 1566, 413 (2013). doi: 10.1063/1.4848470
Th. Bartsch, A. Wetzel, D. Sonnenberg, M. Schmidt, Ch. Heyn, and W. Hansen, "Ballistic thermal point contacts made of GaAs nanopillars", AIP Conference Proceedings 1566, 243 (2013). doi: 10.1063/1.4848376
A. Kotmäe, C. S. Bausch, E. Stava, D. Sonnenberg, W. Hansen, and R. Blick, "Direct Transfer of GaAs Microtube Arrays onto Transparent Substrates for Imaging Neuron Outgrowth", Soft Nanoscience Letters 3, 79-82 (2013). doi: 10.4236/snl.2013.34014
T. Slobodskyy, P. Schroth, A. Minkevich, D. Grigoriev, E. Fohtung, M. Riotte, T. Baumbach, M. Powalla, U. Lemmer, A. Slobodskyy, "Three-dimensional reciprocal space profile of an individual nanocrystallite inside of a thin film solar cell absorber layer", J. Phys. D: Appl. Phys. 46, 475104 (2013). doi: 10.1088/0022-3727/46/47/475104
F. Balhorn, C. Bausch, S. Jeni, W. Hansen, D. Heitmann, and S. Mendach,"Azimuthal spin-wave modes in rolled-up permalloy microtubes: Tuneable mode freuquency, mode patterns, and mode splitting", Physical Review B 88, 0504402 (2013). doi: 10.1103/PhysRevB.88.054402
Ch. Heyn, D. Sonnenberg, Th. Bartsch, A. Wetzel, J. Kerbst, and W. Hansen,"GaAs nanopillars by self-assembled droplet etching", J. of Crystal Growth 378, 446 (2013). doi: 10.1016/j.jcrysgro.2012.12.048
D. Sonnenberg, A. Graf, V. Paulava, W. Hansen, and Ch. Heyn, "Structural properties of ultra-low density nanoholes for the generation of well-separated GaAs quantum dots", J. of Crystal Growth 378, 442 (2013). doi: 10.1016/j.jcrysgro.2012.12.060
B. Rupprecht, S. Heedt, H. Hardtdegen, Th. Schaepers, Ch. Heyn, M. A. and D. Grundler, "Frequency anomaly in the Rashba-effect induced magnetization oscillations of a high-mobility two-dimensional electron system", Physical Review B 87, 035307 (2013).doi: 10.1103/PhysRevB.87.035307
Till Benter, Hauke Lehmann, Toru Matsuyama, Wolfgang Hansen, Christian Heyn, Ulrich Merkt, and Jan Jacob, "Quantized conductance and evidence for zitterbewegung in InAs spin filters", Appl. Phys. Lett. 102, 212405 (2013). doi: 10.1063/1.4807435
Th. Bartsch, A. Wetzel, D. Sonnenberg, M. Schmidt, Ch. Heyn, and W. Hansen, "Thermal conductance of nanosize semiconductor pillars", physica status solidi (a) 210, 161 (2013). doi: 10.1002/pssa.201228400
Ch. Heyn and W. Hansen,"Self-Assembly of Epitaxial III/V-Compound Semiconductor Quantum Dots", In: Crystal Growth: Theory, Mechanisms and Morphology, Editors Nicole A. Mancuso and James P. Isaac, Nova Science Publishers, Chapter 2, (2012).
M. Helfrich, P. Schroth, D. Grigoriev, S. Lazarev, R. Felici, T. Slobodskyy, T. Baumbach, D. M. Schaadt, "Growth and characterization of site-selective quantum dots", physica status solidi (a) 209, 2387 (2012). doi: 10.1002/pssa.201228423
T. Slobodskyy, P. Schroth, D. Grigoriev, A.A. Minkevich, D.Z. Hu, D.M. Schaadt, and T. Baumbach, "A portable molecular beam epitaxy system for in situ x-ray investigations at synchrotron beamlines" Rev. Sci. Instrum. 83, 105112 (2012). doi: 10.1063/1.4759495
D. Sonnenberg, A. Graf, V. Paulava, W. Hansen, and Ch. Heyn, "Highly versatile ultra-low density GaAs quantum dots fabricated by filling of self-assembled nanoholes", Appl. Phys. Lett. 101, 143106 (2012). doi: 10.1063/1.4756945
B. Landgraf, T. Slobodskyy, Ch. Heyn, W. Hansen, "Strain relaxation in metamorphic InAlAs buffers", Materials Science and Engineering: B 177, 762 (2012). doi: 10.1016/j.mseb.2012.03.027
F. Balhorn, S. Jeni, W. Hansen, D. Heitmann, und S. Mendach, "Axial and azimuthal spin-wave eigenmodes in rolled-up permalloy stripes", Appl. Phys. Lett. 100, 222402 (2012). doi: 10.1063/1.3700809
Ch. Strelow, C.M. Schultz, H. Rehberg, M. Sauer, H. Welsch, A. Stemmann, Ch. Heyn, D. Heitmann, and T. Kipp, "Light confinement and mode splitting in rolled-up semiconductor microtube bottle resonators", Phys. Rev. B 85, 5329 (2012). doi: 10.1103/PhysRevB.85.155329
A. Rottler, M. Harland, M. Broll, S. Schwaiger, D. Stickler, A. Stemmann, Ch. Heyn, D. Heitmann, S. Mendach, "Rolled-up nanotechnology for the fabrication of three-dimensional fishnet-type GaAs-metal metamaterials with negative refractive index at near-infrared frequencies", Appl. Phys. Lett. 100, 51104 (2012). doi: 10.1063/1.4704185
Y.F. Ivanov, N.N. Koval, O.V. Krysina, T. Baumbach, S. Doyle, T. Slobodsky, N.A. Timchenko, R.M. Galimov, and A.N. Shmakov "Superhard nanocrystalline Ti–Cu–N coatings deposited by vacuum arc evaporation of a sintered cathode", Surface and Coatings Technology 207, 430 (2012) doi: 10.1016/j.surfcoat.2012.07.037
Ch. Heyn, Ch. Strelow, and W. Hansen, "Excitonic lifetimes in single GaAs quantum dots fabricated by local droplet etching", New Journal of Physics 14, 053004 (2012). doi: 10.1088/1367-2630/14/5/053004
P. Schroth, T. Slobodskyy, D. Grigoriev, A. Minkevich, M. Riotte, S. Lazarev, E. Fohtung, D. Z. Hu, D. M. Schaadt, T. Baumbach "Investigation of buried quantum dots using grazing incidence x-ray diffraction", Materials Science and Engineering: B 177, 721 (2012). doi: 10.1016/j.mseb.2011.10.012
Th. Bartsch, M. Schmidt, Ch. Heyn, and W. Hansen, "Thermal Conductance of Ballistic Point Contacts", Phys. Rev. Lett. 108, 075901 (2012). doi: 10.1103/PhysRevLett.108.075901
M. Schmidt, G. Schneider, Ch. Heyn, A. Stemmann, and W. Hansen, "Zero-field thermopower of a thin heterostructure membrane with a two-dimensional electron gas", Phys. Rev. B 85, 075408 (2012). doi: 10.1103/PhysRevB.85.075408
S. Mansfeld, J. Topp, K. Martens, J. N.Toedt, W. Hansen, D. Heitmann, and S. Mendach, "Spin Wave Diffraction and Perfect Imaging of a Grating", Phys. Rev. Lett. 108, 047204 (2012). doi: 10.1103/PhysRevLett.108.047204
S. Bohse, A. Zolotaryov, A. Volland, B. Landgraf, O. Albrecht, M. Bastjan, T. Vossmeyer, D. Görlitz, Ch. Heyn, and W. Hansen, "Structural and magnetic properties of Ni2MnIn Heusler thin films grown on modulation-doped InAs heterostructures with metamorphic buffer", J. of Crystal Growth 338, 91 (2012). doi: 10.1016/j.jcrysgro.2011.10.020
M. Schmidt, G. Schneider, C. Heyn, A. Stemmann and W. Hansen, "Thermopower of a 2D Electron Gas in Suspended AlGaAs/GaAs Heterostructures", Journal of Electronic Materials 41,1286 (2012).
K. Peters, A. Tittel, N. Gayer, A. Graf, V. Paulava, U. Wurstbauer, and W. Hansen, "Enhancing the visibility of graphene on GaAs", Appl. Phys. Lett. 99 , 191912 (2011). doi: 10.1063/1.3660584
S. Knott, Th.Ch. Hirschmann, U. Wurtsbauer, and W. Hansen, "Magnetoresistance effects and phase coherent transport phenomena in a magnetic nonplanar two-dimensional hole system", Phys. Rev. B 84, 205302 (2011). doi: 10.1103/PhysRevB.84.205302
A. Nemcsics, Ch. Heyn, L. Toth, L. Dobos, A. Stemmann, W. Hansen "Cross-section transmission electron microscopy of GaAs quantum dots fabricated by filling of droplet-etched nanoholes", J. Crystal Growth 335, 58 (2011). doi: 10.1016/j.jcrysgro.2011.09.005
A. A. Minkevich, E. Fohtung, T. Slobodskyy, M. Riotte, D. Grigoriev, M. Schmidbauer, A. C. Irvine, V. Novák, V. Holý, and T. Baumbach, "Selective coherent x-ray diffractive imaging of displacement fields in (Ga,Mn)As/GaAs periodic wires", Phys. Rev. B 84, 054113 (2011). doi: 10.1103/PhysRevB.84.054113
L. Geelhaar, Ch. Heyn, and A. D. Wieck, "Proceedings of the 16th International Conference on Molecular Beam Epitaxy (MBE 2010), Editors Preface", J. Crystal Growth 323, 1 (2011). doi: 10.1016/j.jcrysgro.2011.04.012
A. A. Minkevich, E. Fohtung, T. Slobodskyy, M. Riotte, D. Grigoriev, T. Metzger, A. C. Irvine, V. Novak, V. Holy and T. Baumbach "Strain field in (Ga,Mn)As/GaAs periodic wires revealed by coherent x-ray diffraction", Europ. Phys. Lett. 94, 66001 (2011). doi: 10.1209/0295-5075/94/66001
S. Bohse, A. Zolotaryov, W. Kreuzpaintner, D. Lott, A. Kornowski, A. Stemmann, Ch. Heyn, and W. Hansen, "Supression of interfacial intermixing between MBE-grown Heusler alloy Ni2MnIn and (0 0 1)InAs or InAs-HEMT structures", J. Crystal Growth 323, 368 (2011). doi: 10.1016/j.jcrysgro.2010.11.031.
T. Köppen, D. Franz, A. Schramm, Ch. Heyn, J. Gutjahr, D. Pfannkuche, D. Heitmann, and T. Kipp, "Elementary excitations in charge-tunable InGaAs quantum dots studied by resonant Raman and resonant photoluminescence spectroscopy", Phys. Rev. B 83, 165307 (2011). doi: 10.1103/PhysRevB.83.165307.
Ch. Heyn, A. Stemann, M. Klingbeil, Ch. Strelow, T. Köppen, S. Mendach, and W. Hansen, "Mechanism and applications of local droplet etching", J. Crystal Growth, 323, 263 (2011). doi: 10.1016/j.jcrysgro.2010.10.141.
Ch. Heyn, A. Stemmann, Ch. Strelow, T. Köppen, D. Sonnenberg, A. Graf, S. Mendach, and W. Hansen, "Self-Assembly of Semiconductor Quantum Rings by Local Droplet Etching", J. Nanoelectron. Optoelectron. 6, 62-67 (2011). doi: 10.1166/jno.2011.1134.
Ch. Heyn, "Kinetic model of local droplet etching", Phys. Rev. B 83, 165302 (2011). doi: 10.1103/PhysRevB.83.165302.
V. Polojärvi, A. Schramm, M. Guina, A. Stemmann, and Ch. Heyn "Stacked GaAs quantum dots fabricated by refilling of self-organized nanoholes: Optical properties and post-growth annealing", Nanotechnology 22, 105603 (2011). doi: 10.1088/0957-4484/22/10/105603.
Ch. Heyn, M. Schmidt, S. Schwaiger, A. Stemman, S. Mendach, and W. Hansen, "Air-Gap Heterostructures", Appl. Phys. Lett. 98, 033105 (2011). doi: 10.1063/1.3544047.
Á. Nemcsics, L. Toth, L. Dobos, Ch. Heyn, A. Stemmann, A. Schramm, H. Welsch, and W. Hansen, "Composition of the GaAs quantum dot, grown by droplet epitaxy", Superlattices and Microstructures 48, 351 (2010).
R. Huber, P. Klemm, S. Neusser, B. Botters, A. Wittmann, M. Weiler, S.T.B. Goennenwein, C. Heyn, M. Schneider, P. Böni and D. Grundler, "Advanced techniques for all-electrical spectroscopy on spin caloric phenomena" Solid State Communications 150, 492 (2010).
Christian Heyn, Andrea Stemmann, and Wolfgang Hansen,"Self-Assembly of Quantum Dots and Rings on Semiconductor Surfaces", In: Quantum Materials - Lateral Semiconductor Nanostructures, Hybrid Systems and Nanocrystals (Nanocience and Technology), Editor: D. Heitmann, Springer, 1-22 (2010).
Karen Peters, Stefan Mendach, and Wolfgang Hansen, "Curved Two-Dimensional Electron Systems in Semiconductor Nanoscrollls", In: Quantum Materials - Lateral Semiconductor Nanostructures, Hybrid Systems and Nanocrystals (Nanocience and Technology), Editor: D. Heitmann, Springer, 25-47 (2010).
Andreas Schramm, Christiane Konetzni, and Wolfgang Hansen, "Capacitance Spectroscopy on Self-Assembled Quantum Dots", In: Quantum Materials - Lateral Semiconductor Nanostructures, Hybrid Systems and Nanocrystals (Nanocience and Technology), Editor: D. Heitmann, Springer, 51-75 (2010).
Ch. Heyn, M. Klingbeil, Ch. Strelow, A. Stemmann, S. Mendach, and W. Hansen, "Single-dot Spectroscopy of GaAs Quantum Dots Fabricated by Filling of Self-assembled Nanoholes", Nanoscale Res Lett 5, 1633 (2010).
U. Wurstbauer, S. Knott, C. G. v. Westarp, N. Mecking, K. Rachor, D. Heitmann, W. Wegschneider, and W. Hansen, "Anomalous magnetotransport and cyclotron resonance of high mobility magnetic 2DHGs in the quantum Hall regime", Physica E 42, 1022-1025 (2010).
B. Rupprecht, W. Krenner, U. Wurstbauer, Ch. Heyn, T. Windisch, M. A. Wilde, W. Wegscheider, and D. Grundler, "Magnetism in a Mn modulation-doped InAs/InGaAs heterostructure with a two-dimensional hole system", J. Appl. Phys. 107, 093711 (2010). doi: 10.1063/1.3388303.
Ch. Heyn, A. Stemmann, T. Köppen, Ch. Strelow, T. Kipp, M. Grave, S. Mendach, and W. Hansen, "Optical properties of GaAs quantum dots fabricated by filling of self-assembled nanoholes", Nanoscale Res. Lett. 5, 576 (2010). DOI: 10.1007/s11671-009-9507-3 (2009).
K. Dietrich, Ch. Strelow, C. Schliehe, Ch. Heyn, A. Stemmann, S. Schwaiger, S. Mendach, A. Mews, H. Weller, D. Heitmann, and T. Kipp, "Optical Modes Excited by Evanescent-Wave-Coupled PbS Nanocrystals in Semiconductor Microtube Bottle Resonators", Nano Lett. 10, 627-631 (2010). DOI: 10.1021/n19036966
F. Balhorn, S. Mansfeld, A. Krohn, J. Topp, W. Hansen, D. Heitmann, and S. Mendach, "Spin-Wave Interference in Three-Dimensional Rolled-Up Ferromagnetic Microtubes", Phys. Rev. Lett. 104, 037205 (2010).
U. Wurstbauer, S. Knott, A. Zolotaryov, D. Schuh, W. Hansen, and W. Wegscheider, "Strong localization effect in magnetic two-dimensional hole systems", Appl. Phys. Lett. 96, 022103 (2010).
T. Windisch, X. Huang, S. Dasgupta, B. Rupprecht, Ch. Heyn, M. Bichler, A. Fontcuberta i Morral, M. Grayson, G. Abstreiter, M. A. Wilde, and D. Grundler, "De Haas-van Alphen effect and energy gaps of a correlated two-dimensional electron system in an AlAs two-valley pseudospin system", Phys. Rev. B 80, 205306 (2009). doi: 10.1103/PhysRevB.80.205306.
A. Zolotaryov, A. Schramm, Ch. Heyn, A. Zozulya, and W. Hansen, "Characterisation of droplet-epitaxial GaAs/AlGaAs quantum dot and quantum ring systems using grazing incidence X-ray diffraction", Materials Science in Semiconductor Processing 12, 75 (2009). doi: 10.1016/j.mssp.2009.07.009.
Ch. Strelow, M. Sauer, S. Fehringer, T. Korn, C. Schüller, A. Stemmann, Ch. Heyn, D. Heitmann, and T. Kipp, "Time-resolved studies of a rolled-up semiconductor microtube laser", Appl. Phys. Lett. 95 , 221115 (2009).
N. Ruhe, G. Stracke, Ch. Heyn, D. Heitmann, H. Hardtdegen, Th. Schäpers, B. Rupprecht, M. A. Wilde, and D. Grundler, "Origin and limiting mechanism of induced nonequilibrium currents in gated two-dimensional electron systems", Phys. Rev. B 80, 115336 (2009).
Ch. Heyn, A. Stemmann, and W. Hansen, "Dynamics of self-assembled droplet etching", Appl. Phys. Lett. 95, 173110 (2009).
A. Schramm, S. Schulz, T. Zander, Ch. Heyn, and W. Hansen, "Thermionic tunneling through Coulomb barriers in charged self-assembled quantum dots", Phys. Rev. B 80, 155316 (2009).
T. Köppen, D. Franz, A. Schramm, Ch. Heyn, D. Heitmann, and T. Kipp, "Resonant Raman Transitions into Singlet and Triplet States in InGaAs Quantum Dots Containing Two Electrons", Phys. Rev. Lett. 103, 037402 (2009).
A. Zolotaryov, A. Schramm, Ch. Heyn, and W. Hansen, "X-ray study of temperature dependent growth of InAs/AlAs(001) quantum dots", J. Phys. D: Appl. Phys. 42, 155401 (2009).
A. Schramm, A. Tukiainen, M. Pessa, C. Konetzni, Ch. Heyn, and W. Hansen, "Neutron-irradiated Schottky diodes with self-assembled InAs quantum dots: Optical and electrical properties", J. Appl. Phys. 105, 104308 (2009).
S. Schwaiger, M. Bröll, A. Krohn, A. Stemmann, Ch. Heyn, Y. Stark, D. Stickler, D. Heitmann, and S. Mendach, "Rolled-Up Three-Dimensional Metamaterials with a Tunable Plasma Frequency in the Visible Regime", Phys. Rev. Lett. 102, 163903 (2009).
Ch. Heyn, A. Stemmann, T. Köppen, Ch. Strelow, T. Kipp, S. Mendach, and W. Hansen, "Highly uniform and strain-free GaAs quantum dots fabricated by filling of self-assembled nanoholes", Appl. Phys. Lett. 94, 183113 (2009).
M. A. Wilde, D. Reuter, Ch. Heyn, A. D. Wieck, and D. Grundler, "Inversion-asymmetry-induced spin splitting observed in the quantum oscillatory magnetization of a two-dimensional electron system", Phys. Rev. B 79, 125330 (2009).
Ch. Heyn, A. Stemmann, and W. Hansen, "Nanohole formation on AlGaAs surfaces by local droplet etching with gallium", J. Crystal Growth 311, 1839 (2009).
Ch. Heyn, A. Stemmann, A. Schramm, and W. Hansen , "Droplet epitaxy of GaAs quantum dots on (001), vicinal (001), (110), and (311)A GaAs", J. Crystal Growth 311, 1825 (2009).
Ch. Heyn, A. Stemmann, R. Eiselt, and W. Hansen, "Influence of Ga coverage and As pressure on local droplet etching of nanoholes and quantum rings", J. Appl. Phys. 105, 054316 (2009).
A. Zolotaryov, A. Volland, Ch. Heyn, D. Novikov, G. Stryganyuk, A. Kornowski, T. Vossmeyer, O. Albrecht, E. Coric, and W. Hansen, "Influence of growth temperature on phase and intermixing in Ni2MnIn Heusler films on InAs(001) ", J. Crystal Growth 311, 2397 (2009).
S. Mendach, J. Podbielski, J. Topp, W. Hansen, and D. Heitmann, "Spin-wave confinement in rolled-up ferromagnetic tubes", Appl. Phys. Lett. 93, 262501 (2008). doi: 10.1063/1.3058764
A. Stemmann, Ch. Heyn, T. Köppen, T. Kipp, and W. Hansen, "Local droplet etching of nanoholes and rings on GaAs and AlGaAs surfaces", Appl. Phys. Lett. 93, 123108 (2008).
Ch. Strelow, H. Rehberg, C. M. Schultz, H. Welsch, Ch. Heyn, D. Heitmann, and T. Kipp, "Spacial emission characteristics of a semiconductor microtube ring resonator", Physica E 40, 1836 (2008).
Ch. Strelow, H. Rehberg, C. M. Schultz, H. Welsch, Ch. Heyn, D. Heitmann, and T. Kipp, "Optical microcavities formed by semiconductor microtubes using a bottlelike geometry", Phys. Rev. Lett. 101, 127403 (2008).
A. Zolotaryov, Ch. Heyn, and W. Hansen, "MBE-growth of InAs/GaAs(001) quantum dots at low temperatures", J. Crystal Growth 310, 4122 (2008). doi: 10.1016/j.jcrysgro.2008.07.013
A. Schramm, S. Schulz, Ch. Heyn, and W. Hansen, "Suppression of competing tunneling processes in thermally-activated carrier emission on self-assembled InAs quantum dots", Phys. Rev. B 77, 153308 (2008).
H. Welsch, T. Kipp, T. Köppen, Ch. Heyn, and W. Hansen, "Spatially and energetically resolved optical mapping of self-aligned InAs quantum dots", Semicond. Sci. Technol. 23, 045016 (2008).
K.-B. Broocks, B. Su, P. Schröter, Ch. Heyn, D. Heitmann, W. Wegscheider, V. M. Apalkov, T. Chakraborty, I. E. Perakis, and C. Schüller, "Linear and ultrafast optical spectroscopy in the regime of the quantum Hall effect", Phys.stat. sol. (b) 245, 321 (2008).
G. Maruccio, M. Janson, A. Schramm, C. Meyer, T. Matsui, C. Heyn, W. Hansen, R. Wiesendanger, M. Rontani, and E. Molinari, "Correlation Effects in Wave Function Mapping of Molecular Beam Epitaxy Grown Quantum Dots", Nano Lett. 7, 2701 (2007).
A. Zolotaryov, A. Schramm, Ch. Heyn, and W. Hansen, "InAs-coverage dependence of self-assembled quantum dot size, composition, and density", App. Phys. Lett. 91, 083107 (2007).
Ch. Strelow, C. M. Schultz, H. Rehberg, H. Welsch, Ch. Heyn, D. Heitmann, and T. Kipp, "Three dimensionally confined optical modes in quantum-well microtube ring resonators", Phys. Rev. B 76, 045303 (2007).
Ch. Heyn, A. Stemmann, A. Schramm. J. Welsch, W. Hansen, and Á. Nemcsics, "Regimes of GaAs quantum dot self-assembly by droplet epitaxy", Phys. Rev. B 76, 075317 (2007).
A. Zolotaryov, A. Bolz, A. Schramm, W. Hansen, and R. L. Johnson, "Oxidation as an assistant tool for structural analysis of inhomogeneous nanoscale InAs/AlAs(001) island system", Phys. stat. sol. (a) 204, 2662 (2007).
A. Schramm, J. Schaefer, S. Schulz, W. Hansen, "Constant capacitance-DLTS on InAs-quantum dots embedded in Schottkydiodes", AIP Conf. Proc. 893, 833 (2007).
Ch. Heyn, A. Stemmann, A. Schramm, H. Welsch, W. Hansen, and Á. Nemcsics, "Faceting during GaAs quantum dot self-assembly by droplet epitaxy", Appl. Phys. Lett. 90, 203105 (2007).
M. Rontani, E. Molinari, G. Maruccio, M. Janson, A. Schramm, C. Meyer, T. Matsui, Ch. Heyn, W. Hansen, and R. Wiesendanger,"Imaging correlated wave functions of few-electron quantum dots: Theory and scanning tunneling spectroscopy experiments", J. Appl. Phys. 101, 081714 (2007).
Ch. Heyn, A. Schramm, T. Kipp, and W. Hansen, "Kinetic model of intermixing during self-assembled InAs quantum dot formation", J. Crystal Growth, 301-302, 692 (2007).
A. Schramm, J. Schaefer, T. Kipp, Ch. Heyn, and W. Hansen, "Shape transformation of self-assembled InAs quantum dots by overgrowth with GaAs and A1As", J. Crystal Growth, 301-302, 748 (2007).
H. Welsch, T. Kipp, Ch. Heyn, and W. Hansen, "Lateral self-arrangement of self-assembled InAs quantum dots by an intentional induced dislocation network", J. Crystal Growth, 301-302, 759 (2007).
A. Schramm, S. Schulz, J. Schaefer, Ch. Heyn, and W. Hansen, "Tunnelling Transient Spectroscopy on self-assembled InAs Quantum Dots", AIP Conf. Proc. 893, 763 (2007).
O. Schumacher, M. Stampe, Ch. Heyn, and W. Hansen, "Magneto-resistance studies on evenly curved Hall bars in InGaAs/GaAs-microtubes", AIP Conf. Proc. 893, 689 (2007).
R. Dinter, H. Stillrich, Ch. Heyn, S. Pütter, H. P. Oepen, W. Hansen, A. Frömsdorf, S. Förster, W. Lee, and K. Nielsch, "Shallow HEMTs For Lateral Magnetic Superlattices", AIP Conf. Proc. 893, 573 (2007).
T. Kipp, Ch. Strelow, H. Welsch, Ch. Heyn, and D. Heitmann, "Optical Microtube Ring Resonators", AIP Conf. Proc. 893, 1127 (2007).
M. Hoener, O. Kronenwerth, Ch. Heyn, and D. Grundler, "Geometry-enhanced magnetoresistance of narrow Au/InAs hybrid structures incorporating a two-dimensional electron system", J. Appl. Phys. 99, 036102 (2006).
N. Ruhe, J. I. Springborn, Ch. Heyn, M.A. Wilde, and D. Grundler, "Simultaneous measurement of the de Haas-van Alphen and the Shubnikov-de Haas effect in a two- dimensional electron system", Phys. Rev. B 74, 235326 (2006).
A. F. Dethlefsen, Ch. Heyn, D. Heitmann, and C. Schüller, "Confined acoustic and optical plasmons in double-layered quantum-wire arrays with strong tunneling", Phys. Rev. B 73, 193307 (2006).
G. Maruccio, M. Janson, A. Schramm, C. Meyer, T. Matsui, W. Hansen, R. Wiesendanger, M. Rontani, and E. Molinari, "Correlation effects in wave-function mapping of MBE-grown quantum dots", Proceedings of the ICN+T conference, 2006.
J. I. Springborn, N. Ruhe, Ch. Heyn, M. A. Wilde, D. Heitmann, and D. Grundler, "Gate-controlled de Haas-van Alphen effect in an interacting two-dimensional electron system", Physica E 34, 172 (2006), Proceedings of the 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-16).
T. Kipp, H. Welsch, Ch. Strelow, Ch. Heyn, and D. Heitmann, "Optical Modes in Semiconductor Microtubes Ring Resonators", Phys. Rev. Lett. 96, 077403 (2006).
A. Schramm, T. Kipp, F. Wilde, J. Schaefer, Ch. Heyn, and W. Hansen, "Shape transformation of self-assembled InAs quantum dots during overgrowth with AlAs", J. Crystal Growth 289, 81(2006).
A. Schramm, S. Schulz, J. Schaefer, T. Zander, Ch. Heyn, and W. Hansen, "Electron emission from self-assembled quantum dots in strong magnetic fields", Appl. Phys. Lett. 88, 213107(2006).
S. Schulz, A. Schramm, Ch. Heyn, and W. Hansen, "Tunnelling emission from self-assembled InAs quantum dots probed with capacitance transients", Phys. Rev. B 74, 033311 (2006).
S. Mendach, O. Schumacher, M. Holz, H. Welsch, Ch. Heyn, and W. Hansen, "Evenly curved two-dimensional electron systems in rolled-up Hall-bars", Appl. Phys. Lett. 88, 212113 (2006).
S. Mendach, T. Kipp, H. Welsch, O. Schumacher, Ch. Heyn, and W. Hansen, "Interlocking mechanism for the fabrication of closed single-walled semiconductor microtubes", Semicond. Sci. Technol. 20, 402 (2005).
O. Schumacher, S. Mendach, H. Welsch, A. Schramm, Ch. Heyn, and W. Hansen, "Lithographically defined metal-semiconductor-hybrid nanoscrolls", Appl. Phys. Lett. 86, 143109 (2005).
K. Bittkau, N. Mecking, Y. S. Gui, Ch. Heyn, D. Heitmann, and C.-M. Hu, "Photoconductivity of In xAl1-xAs parabolic quantum wells in the optical-phonon regime", Phys. Rev. B 71, 035337 (2005) .
Ch. Heyn, A. Bolz, T. Maltezopoulos, R. L. Johnson, and W. Hansen, "Intermixing in self-assembled InAs quantum dot formation", J. Crystal Growth 278, 46 (2005). Proceedings of the 13th international Conference on Molecular Beam Epitaxy, Edinburgh/GB (2004).
Ch. Heyn and A. Bolz, "Temperature regimes of strain-induced InAs quantum dot formation", B. A. Joyce et al. (eds.), Quantum Dots: Fundamentals, Applications, and Frontiers, 103-119. 2005 Springer. Proceedings of the NATO Advanced Research Workshop on "Quantum Dots: Fundamentals, Applications, and Frontiers" in Crete/Greece (2003).
Ch. Heyn and S. Cunis, "Shutter transients during solid-source epitaxy", J. Vac. Sci. Technol. B 23, 2014 (2005).
T. Kipp, K. Petter, Ch. Heyn, D. Heitmann, and C. Schüller, "Optically pumped lasing from localized states in quantum-well and quantum-dot microdisks", AIP Conf. Proc. 772, 1115 (2005).
C. Zehnder, S. Löhr, A. Wirthmann, Y. S. Gui, Ch. Heyn, W. Hansen, D. Heitmann, and C.-M. Hu, "Experimental study on far-infrared photoconductivity and magnetoresistance in InAs single quantum wire", AIP Conf. Proc. 772, 829 (2005).
S. Schulz, T. Zander, A. Schramm, Ch. Heyn, and W. Hansen, "Field effect enhanced carrier-emission from InAs Quantum Dots", AIP Conf. Proc. 772, 807 (2005).
S. Löhr, Ch. Heyn, and W. Hansen, "Magnetotransport in nonplanar two-dimensional electron gases in InAs heterostructures", AIP Conf. Proc. 772, 493 (2005).
M. A. Wilde, M. Rhode, Ch. Heyn, F. Schäffler, U. Zeitler, R. J. Haug, D. Heitmann, and D. Grundler, "Magnetization of modulation doped Si/SiGe quantum wells in high magnetic fields", AIP Conf. Proc. 772, 451 (2005).
M. A. Wilde, M. Rhode, Ch. Heyn, D. Heitmann, D. Grundler, U. Zeitler, F. Schäffler, and R. J. Haug, "Direct measurements of the spin and valley splittings in the magnetization of a Si/SiGe quantum well in tilted magnetic fields", Phys. Rev. B 72, 165429 (2005).
S. Mendach, H. Welsch, Ch. Heyn, and W. Hansen, "Magnetotransport On Evenly Curved Hall-Bars in InGaAs/GaAs-Microtubes", AIP Conf. Proc. 772, 451 (2005).
T. Brocke, M.-T. Bootsmann, B. Wunsch, M. Tews, D. Pfannkuche, Ch. Heyn, W. Hansen, D. Heitmann, and C. Schüller, "Inelastic Light Scattering on Few-Electron Quantum-Dot Atoms", Physica E 22, 478 (2004), Proceedings of the 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15).
D. Reuter, C. Werner, C. Riedesel, A. D. Wieck, D. Schuster and W. Hansen, "Fabrication of two-dimensional p-n-junctions formed by compensation doping of p-modulation doped GaAs/ InyGa1-yAs/AlxGa1-xAS heterostructures", Proceedings EP2DS 2003 in Nara, Physica E 22, 725 (2004).
S. Schulz, S. Schnüll, Ch. Heyn, and W. Hansen, "Charge-state dependence of InAs quantum-dot emission energies", Phys. Rev. B 69, 195317 (2004).
S. Schulz, T. Zander, A. Schramm, Ch. Heyn, and W. Hansen, "Field effect enhanced carrier-emission from InAs Quantum Dots", Proceedings of the 27 ICPS, July 2004.
S. Löhr, Ch. Heyn, and W. Hansen, "Magnetotransport in nonplanar two-dimensional electrongasses in InAs heterostructures", Proceedings of the 27 ICPS, July 2004.
S. Mendach, O. Schumacher, Ch. Heyn, S. Schnüll, H. Welsch, and W. Hansen, "Preparation of curved two-dimensional electron systems in InGaAs/GaAs-microtubes", Physica E 23, 274 (2004).
S. Löhr, Ch. Heyn, and W. Hansen, "Nonplanar two-dimensional electron gases in InAs heterostructures on GaAs", Appl. Phys. Lett. 84, 550 (2004).
H. Rolff, W. Pfützner, Ch. Heyn, and D. Grundler, "Hall magnetometry on a ferromagnetic nanoring", Journal of Magnetism and Magnetic Materials 272-276, 1623 (2004), Proceedings of the International Conference on Magnetism (ICM 2003).
C. Schüller, K.-B. Broocks, P. Schröter, Ch. Heyn, D. Heitmann, M. Bichler, W. Wegscheider, T. Chakraborty, and V. M. Apalkov, "How to probe a fractionally charged quasihole?", Physica E 22, 131 (2004), 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15).
M. A. Wilde, J. I. Springborn, Ch. Heyn, D. Heitmann, and D. Grundler, "Magnetization of GaAs quantum wires with quasi one-dimensional electron systems," Physica E 22, 729 (2004), 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-15).
T. Kipp, K. Petter, Ch. Heyn, D. Heitmann, and C. Schüller, "Broadband emission and low absorption in microdisks with AlGaAs quantum wells", Appl. Phys. Lett. 84, 1477 (2004).
T. Kipp, K. Petter, Ch. Heyn, D. Heitmann, and C. Schüller, "Spectroscopy of individual AlGaAs microdisks in large periodic arrays", Physica E 21, 830 (2004), Proceedings of the Eleventh International Conference on Modulated Semiconductor Structures.
C. H. Möller, O. Kronenwerth, Ch. Heyn, and D. Grundler," Low-noise magnetic-flux sensors based on the extraordinary magnetoresistance effect", Appl. Phys. Lett. 84, 3343 (2004).
K. Bittkau, C. Zehnder, Ch. Heyn, D. Heitmann, and C.-M. Hu, "Intrasubband magnetoplasmon LO-phonon coupling in an InAs antidot array", Phys. Rev. B 70, 125314 (2004).
S. Holland, Ch. Heyn, D. Heitmann, E. Batke, R. Hey, K. J. Friedland, and C.-M. Hu, "Quantized Dispersion of Two-Dimensional Magnetoplasmons Detected by photoconductivity Spectroscopy", Phys. Rev. Lett. 93, 186804 (2004).
S. Löhr, S. Mendach, T. Vonau, Ch. Heyn, and W. Hansen, "Highly anisotropic electron transport in shallow InGaAs heterostructures", Phys. Rev. B 67, 45309 (2003).
B. Su, L. Karsten, C. Schüller, D. Heitmann, A.A. Zhukov, Ch. Heyn and W. Hansen, "Optical Detectrion of the Charging of InAs Quantum Dots with Different Backgate Configurations", Mat. Res. Soc. Symp. Proc. Vol. 737, E16.2.1 (2003).
S. Beyer, S. Löhr, Ch. Heyn, D. Heitmann, and W. Hansen, "Electronic properties of etched-regrown heterostructure interfaces", J. Crystal Growth 251, 96 (2003).
Ch. Heyn and W. Hansen, "Desorption of InAs quantum dots", J. Crystal Growth 251, 218 (2003).
Ch. Heyn and W. Hansen, "Ga/In-Intermixing and Segregation during InAs Quantum Dot Formation", J. Crystal Growth 251, 140 (2003).
Ch. Heyn, S. Mendach, S. Löhr, S. Beyer, S. Schnüll, and W. Hansen, "Growth of shallow InAs HEMTs with metamorphic buffer", J. Crystal Growth 251, 832 (2003).
A. A. Zhukov, Ch. Weichsel, S. Beyer, S. Schnüll, Ch. Heyn, and W. Hansen, "Transport properties of a two-dimensional electron gas in the vicinity of quantum dots in the limit of strong disorder", Phys. Rev. B 67, 125310 (2003).
S. Schulz, S. Schnüll, Ch. Heyn, and W. Hansen, "Measurement of the ionization energy in quantum dot Helium", in: Physics of Semiconductors 2002, Proceedings of the 26th International Conference on the Physics of Semiconductors, Edinburgh 2002, Institute of Physics Conference Series Number 171, ed. by A.R. Long and J.H.Davies (Institute of Physics Publishing: Bristol and Philadelphia, 2003) P239.
I. Pallecchi, J. Lohse, Ch. Heyn, B. Kramer, and W. Hansen, "Study of spin-splitting in one-dimensional systems by magneto-capacitance measurements", in: Physics of Semiconductors 2002, Proceedings of the 26th International Conference on the Physics of Semiconductors, Edinburgh 2002, Institute of Physics Conference Series Number 171, ed. by A.R. Long and J.H.Davies (Institute of Physics Publishing: Bristol and Philadelphia, 2003) H183.
C.-M. Hu, C. Zehnder, Ch. Heyn, and D. Heitmann, "THz collective spin-flip excitation of a two-dimensional electron system", Phys. Rev. B 67, 201302(R), (2003).
M.-T. Bootsmann, C.-M. Hu, Ch. Heyn, D. Heitmann, and C. Schüller, "Acoustic plasmons and indirect intersubband excitations in tunneling-coupled GaAs-AlxGa1-xAs double quantum wells" , Phys. Rev. B 67, 121309(R), (2003).
C. Schüller, K.-B. Broocks, P. Schröter, Ch. Heyn, D. Heitmann, M. Bichler, W. Wegscheider, Tapash Chakraborty, and V.M. Apalkov, "THz Optical Probing of a Fractionally Charged Quasihole in an Incompressible Liquid", Phys. Rev. Lett. 91, 116403 (2003).
A. Bolz, Ch. Heyn, C. Kumpf, Th. Maltezopoulos, R. L. Johnson, and W. Hansen, "Grazing-incidence X-ray diffraction on InAs/AlAs quantum dots", Proceedings of the MSS 2003.
C. Zehnder, A. Wirthmann, Ch. Heyn, D. Heitmann and C.-M. Hu, "Bolometric spin effect due to internal spin injection in a two-dimensional electron system", Europhys. Lett. 63, 576 (2003).
C. H. Möller, Ch. Heyn, and D. Grundler, "Spin splitting in narrow InAs quantum wells with In 0.75Ga 0.25As barrier layers", Appl. Phys. Lett. 83, 2181 (2003).
C. Schüller, K.-B. Broocks, P. Schröter, Ch. Heyn, D. Heitmann, M. Bichler, W. Wegscheider, "Publisher's Note: Optical Probing of a Fractionally Charged Quasihole in an Incompressible Liquid", Phys. Rev. Lett. 91, 116403 (2003).
T. Maltezopoulos, A. Bolz, C. Meyer, Ch. Heyn, W. Hansen, M. Morgenstern, and R. Wiesendanger, "Wave-Function Mapping of InAs Quantum Dots by Scanning Tunneling Spectroscopy", Phys. Rev. Lett. 91, 196804 (2003).
K. Bittkau, Ch. Menk, Ch. Heyn, D. Heitmann, and C.-M. Hu, "Far-infrared photoconductivity of electrons in an array of nanostructured antidots", Phys. Rev. B 68, 195303 (2003).
M. P. Schwarz, D. Grundler, Ch. Heyn, D. Heitmann, D. Reuter, and A. Wieck, "Induced nonequilibrium currents in the magnetization of mesoscopic dots in the quantum Hall regime", Phys. Rev. B 68, 245315 (2003).
T. Brocke, M.-T. Bootsmann, M. Tews, B. Wunsch, D. Pfannkuche, Ch. Heyn, W. Hansen, D. Heitmann, and C. Schüller, "Spectroscopy of Few-Electron Collective Excitations in Charge-Tunable Artificial Atoms", Phys. Rev. Lett. 91, 257401 (2003).
C.H. Möller, D. Grundler, O. Kronenwerth, Ch. Heyn, and D. Heitmann, "Effect of interface resistance on the extraordinary magnetoresistance of semiconductor/metal hybrid structures", Journal of Superconductivity: Incorporating Novel Magnetism 16, 195 (2003).
S. Holland, C. -M. Hu, Ch. Heyn, and D. Heitmann, "Bernstein modes in tunneling-coupled quantum wells", Superlattices and Microstructures 33, 301 (2003).
Ch. Weichsel, D. Schuster, Ch. Heyn, and W. Hansen, "Magneto-resistance of a two-dimensional electron gas with tunable periodic lateral modulation by interdigital gates", Superlattices and Microstructures 33, 279 (2003).
T. Brocke, M.-T. Bootsmann, C. Schüller, Ch. Heyn, W. Hansen, D. Heitmann, B. Wunsch, M. Tews, and D. Pfannkuche, "Electronic excitations in charge-tunable InAs quantum dots detected by inelastic light scattering", Konferenzbeitrag zur "7th International Conference on Intersubband Transitions in Quantum Wells", September 1-5, 2003, Evolene, Switzerland.
T. Korn, A. Franke-Wiekhorst, S. Schnüll, and I. Wilke, "Characterization of nanometer As-clusters in low temperature grown GaAs by transient reflectivity measurements", J. Appl. Phys. 91, 2333 (2002).
S. Holland, C.-M. Hu, Ch. Heyn, and D. Heitmann, "Plasmons in tunneling coupled bilayer systems with tunable space symmetry studied by far-infrared spectroscopy", Phys. Rev. B 66, 073305 (2002).
V. Gudmundsson, R. Krahne, Ch. Heyn, and D. Heitmann, "Excitations below the Kohn mode, FIR-absorption in quantum dots", Physica Scripta T 101, 136 (2002).
S. Holland, K. Bittkau, C.-M. Hu, Ch. Heyn, and D. Heitmann, "Filling-factor-dependent oscillations of the coupled intersubband plasmon-LO phonon mode in a tunneling coupled-bilayer system", Phys. Rev. B 66, 233302 (2002).
T. Kipp, L. Rolf, C. Schüller, D. Endler, Ch. Heyn, D. Heitmann, "Optical double resonance of electronic Raman scattering in an AlAs-AlGaAs microcavity", Physica E 13, 408 (2002).
K.-B. Broocks, P. Schröter, D. Heitmann, Ch. Heyn, C. Schüller, M. Bichler, and W. Wegscheider, "Anomalous dispersion of charged excitons in dilute two-dimensional electron systems at low temperatures", Phys. Rev. B 66, R041309 (2002).
S. Löhr, S. Schnüll, Chr. Heyn, and W. Hansen, "Shallow InAs high electron mobility transistors", in: Physics of Semiconductors 2002, Proceedings of the 26th International Conference on the Physics of Semiconductors, Edinburgh 2002, Institute of Physics Conference Series Number 171, ed. by: A.R. Long and J.H. Davies (Institute of Physics Publishing: Bristol and Philadelphia, 2003) D239.
Ch. Heyn, "Stability of InAs quantum dots", Phys. Rev. B 66, 075307 (2002).
S. Beyer, S. Löhr, Ch. Heyn, D. Heitmann, and W. Hansen, "Etching dependent mobilities up to 190.000 cm2/Vs at chlorine etched and regrown interfaces", Physica E 13, 653 (2002).
K. Petter, T. Kipp, Ch. Heyn, D. Heitmann, and C. Schüller, "Fabrication of large periodic arrays of AlGaAs microdisks by laser-interference lithography and selective etching", Appl. Phys. Lett. 81, 592 (2002).
M. P. Schwarz, D. Grundler, H. Rolff, M. Wilde, S. Groth, Ch. Heyn, and D. Heitmann, "De Haas-van Alphen effect in a two-dimensional electron system", Physica E 12, 140 (2002).
M. P. Schwarz, M. Wilde, S. Groth, D. Grundler, Ch. Heyn, and D. Heitmann, "Sawtoothlike de Haas-van Alphen oscillations of a two-dimensional electron system", Phys. Rev. B 65, 245315 (2002).
R. Krahne, V. Gudmundsson, Ch. Heyn, and D. Heitmann, "Inter-dot interaction in an array of elliptical quantum dots", Physica E 12 , 892 (2002).
C. H. Möller, O. Kronenwerth, D. Grundler, W. Hansen, Ch. Heyn, and D. Heitmann, "Extraordinary magnetoresistance effect in a microstructured metal-semiconductor hybrid structure", Appl. Phys. Lett. 80, 3988 (2002).
M. P. Schwarz, D. Grundler, M. Wilde, Ch. Heyn, and D. Heitmann, "Magnetization of semiconductor quantum dots", J. Appl. Phys. 91, 6875 (2002).
I. Pallecchi, Ch. Heyn, J. Lohse, B. Kramer, and W. Hansen, "Magnetocapacitance of quantum wires: Effect of confining potential on one-dimensional subbands and suppression of exchange enhanced g factor", Phys. Rev. B 65, 125303 (2002).
S. Mendach , C. M. Hu, Ch. Heyn, S. Schnüll, H. P.Oepen, R. Anton, and W. Hansen, "Strain relaxation in high-mobility InAs inserted-channel heterostructures with metamorphic buffer", Physica E 13, 1204 (2002).
C. Schüller, K.-B. Brooks, Ch. Heyn and D. Heitmann, "Oscillator strengths of dark charged excitons at low electron filling factors", Phys. Rev. B 65, R081301 (2002).
D. Grundler, T. M. Hengstmann, N. Klockmann, Ch. Heyn, and D. Heitmann, "Bend-resistance magnetometry on inhomogeneus magnet field patterns", Physica E 12, 248 (2002).
N. Nemec, A. Pashkinm, P. Kuzel, M. Khazan, S. Schnüll, and I. Wilke"Carrier dynamics in low-temperature grown GaAs studied by Terahertz emissions spectroscopy", J. Appl. Phys. 90, 1303 (2001).
J. Falta, T. Schmidt, K. Zhang, Ch. Heyn and W. Hansen, "Grazing Incidence X-Ray Investigations of InAs Quantum Dots on GaAs (001)", Research at HASYLAB, Examples pp. 38 (2001).
R. Kosuch, G. Falkenberg, O. Bunk, A. Bolz, L. Plucinski, F. Wu and R. L. Johnson, "Studying Self Organised Nanostructures with Synchrotron Light", Research at HASYLAB, Examples pp. 41 (2001).
K.-B. Brooks, T. Ebeling, L. Karsten, C. Schüller, Ch. Heyn and D. Heitmann, "Electric Field Dependent Zeeman Splitting of Excitons in Diluted Two-DImensional Electron Systems", Phys. Stat. Sol. 227, 339 (2001).
Ch. Heyn, "Critical coverage for strain-induced formation of InAs quantum dots", Phys. Rev. B 64, 165306 (2001).
Ch. Heyn and C. Dumat, "Formation and size evolution of self-assembled quantum dots", J. Crystal Growth 227/228, 990 (2001).
Ch. Heyn, C. Klein, S. Kramp, S. Beyer, S. Günther, D. Heitmann, and W. Hansen, "Fabrication of quantum wires by in-situ ion etching and MBE overgrowth", J. Crystal Growth 227/228, 980 (2001).
K. Zhang, Ch. Heyn, W. Hansen, Th. Schmidt, and J. Falta, "Structural characterization of self-assembled InAs quantum dots grown by MBE", J. Crystal Growth 227/228, 1020 (2001).
E.V. Deviatov, A.A. Shashkin, V.T. Dolgopolov, W. Hansen, and M. Holland, "Tunneling measurements of the Coulomb pseudogap in a two-dimensional electron system in quantizing magnetic fields", Proc. 25th Int. Conf. Phys. Semicond. Osaka 2000, Eds. N. Miura and T. Ando, Springer Proceedings in Physics Vol. 87, p. 953 (Springer, Heidelberg 2001).
E. Ulrichs, C. Steinebach, C. Schüller, Ch. Heyn, W. Hansen, and D. Heitmann, "Character of electronic excitations in GaAs-AlGaAs quantum structures", Proc. 25th Int. Conf. Phys. Semicond. Osaka 2000, Eds. N. Miura and T. Ando, Springer Proceedings in Physics Vol. 87, p. 713 (Springer, Heidelberg 2001).
R. Krahne, V. Gudmundsson, Ch. Heyn, and D. Heitmann, "Far-infrared excitations below the Kohn mode: Internal motion in a quantum dot", Phys. Rev. B 63, 195303 (2001).
K. Zhang, J. Falta, Ch. Heyn, Th. Schmidt, and W. Hansen, "Lateral distribution of buried self-assembled InAs quantum dots on GaAs", Proc. 25th Int. Conf. Phys. Semicond., Osaka 2000, Eds. N. Miura and T. Ando, Springer Proceedings in Physics Vol. 87, p. 371 (Springer, Heidelberg 2001).
K. Zhang, Ch. Heyn, W. Hansen, Th. Schmidt, and J. Falta, "Grazing incidence structural characterization of InAs quantum dots on GaAs", Appl. Surf. Sci. 175/176, 606 (2001).
T. Kipp, L. Rolf, C. Schüller, D. Endler, Ch. Heyn, and D. Heitmann, "Selectively Enhanced Inelastic Light Scattering of Electronic Excitations in a Semiconductor Microcavity", Phys. Rev. B 63, 195304 (2001).
T. M. Hengstmann, D. Grundler, Ch. Heyn and D. Heitmann, "Stray-field investigation on permalloy nanodisks", J. Applied Physics 90, 6542 (2001).
M. Hochgräfe, Ch. Heyn, and D. Heitmann, "Intersection and anticrossing of far-infrared modes in elliptical quantum dots with tunable ellipticity", Phys. Rev B 63, 35301 (2001).
M. Hochgräfe, B. P. van Zyl, Ch. Heyn, D. Heitmann, and E. Zaremba, Far-infrared excitations in rectangular antidot arrays"'', Phys Rev. B 63, 33316 (2001).
Ch. Heyn, "Anisotropic island growth during submonolayer epitaxy", Phys. Rev. B 63, 33403 (2001).
R. Krahne, M. Hochgräfe, Ch. Heyn, D. Heitmann, M. Hauser, and K. Eberl, "Excitation of two-dimensional plasmons with cross-grating couplers", Phys. Rev. B 62, 15345 (2000).
K. Zhang, J. Falta, Th. Schmidt, Ch. Heyn, G. Materlik, and W. Hansen, "Distribution and shape of self assembled InAs quantum grown dots on GaAs(001)", Pure Appl. Chem. 72, 199 (2000).
K. Zhang, Ch. Heyn, W. Hansen, Th. Schmidt, and J. Falta, "Strain status of self-assembled InAs quantum dots", Appl. Phys. Lett. 77, 1295 (2000).
A. Richter, M. Koch. T. Matsuyama, Ch. Heyn, and U. Merkt, "Transport properties of modulation doped InAs inserted channel In0.75Al0.25As/In0.75Ga0.25As structures grown on GaAs substrates", Appl. Phys. Lett. 77, 3227 (2000).
R. Krahne, M. Hochgräfe, Ch. Heyn, and D. Heitmann, "Bernstein modes in density-modulated two-dimensional electron systems and quantum dots", Phys. Rev. B 61, R16319 (2000).
M.P. Schwarz, D. Grundler, I. Meinel, Ch. Heyn, and D. Heitmann "Micromechanical cantilever-magnetometer with an integrated two-dimensional electron system", Appl. Phys. Lett. 76, 3564 (2000).
Ch. Heyn, D. Endler, K. Zhang and W. Hansen, "Formation and dissolution of self-assembled InAs quantum dots", J. Crystal Growth 210, 421 (2000).
C. Klein, S. Kramp, S. Beyer, Ch. Heyn, W. Hansen, and D. Heitmann, "Characterization of in-situ Etched and MBE Regrown GaAs Interfaces using C-V Measurements, Far Infrared Spectroscopy and Magnetotransport Measurements", J. Vac. Sci. Technol. B 18, 1562 (2000).
K. Zhang, Ch. Heyn, W. Hansen, Th. Schmidt and J. Falta, "Ordering and Shape of Self-Assembled InAs Quantum Dots on GaAs (001)", Appl. Phys. Lett. 76, 2229 (2000).
E.V. Deviatov, A.A. Shashkin, V.T. Dolgopolov, W. Hansen and M. Holland, "Tunneling Measurement of the Coulomb Pseudogap in a Two-Dimensional Electron System in a Quantizing Magnetic Field", Phys. Rev. B 61, 2939 (2000).
D. Schmerek and W. Hansen, "Capacitance of Quantum Wires: Simulation Calculations and Experiment", Physica E 6, 547 (2000).
I. Meinel, D. Grundler, T. Hengstmann, Ch. Heyn, D. Heitmann, W. Wegscheider, and M. Bichler, "Spin-dependent exchange and correlation effects on the orbital magnetisation of two-dimensional elctron systems", Physica E 6, 731 (2000).
E. Ulrichs, C. Steinebach, Ch. Schüller, Ch. Heyn, and D. Heitmann, "Coulomb-interaction-induced crossover from confined to bulk quantum-dot states in a magnetic field", Physica E 6, 364 (2000).
M. Hochgräfe, R. Krahne, Ch. Heyn, and D. Heitmann, "Pillow-shape motion in antidot arrays", Physica E 6, 507 (2000).
G. Meier, D. Grundler, K. -B. Brookes, Ch. Heyn, and D. Heitmann, "Effect of tilted magnetic fields on bistable nanomagnets in hybrid semiconductor/ferromagnet devices", J. Magn. Magn. Mater. 210, 138 (2000).
K. Zhang, A. Foede, Th. Schmidt, P. Sonntag, Ch. Heyn. G. Materlik, W. Hansen, and J. Falta, "X-Ray Interface Characterization of Buried InAs Layers on GaAs (001)", Phys. Stat. Sol. 215, 791 (1999).
D. Schmerek and W. Hansen, "Exchange and Correlation Effects on the Ground States of Quantum Wires", Phys. Rev. B 60, 4485 (1999).
S. Bargstädt-Franke, Ch. Heyn, W. Hansen, and D. Heitmann, "Coupled double parabolic quantum wells grown with the analogue technique", J. Cryst. Growth 200/201, 790 (1999).
M. Hochgräfe, R. Krahne, Ch. Heyn, and D. Heitmann, "Anticrossing of the one-dimensional plasmon and the Kohn's mode in periodically modulated quantum wires", Phys. Rev. B 60, R13974 (1999).
M. Hochgräfe, R. Krahne, Ch. Heyn, and D. Heitmann, "Anticyclotron motion in antidot arrays", Phys. Rev. B 60, 10680 (1999).
Ch. Heyn, T. Franke, and R. Anton, "Modelling of compound semiconductor epitaxy", Proceedings of the 10th international Conference on Molecular Beam Epitaxy, Cannes/France, (1998) J. Cryst. Growth, 200/201, 67 (1999).
D. Grundler, G. Meier, K.-B. Brooks, Ch. Heyn, and D. Heitmann, "Magnetisation of small arrays of interacting single-domain particles", J. Appl. Phys. 85, 6175 (1999).
A.O. Govorov and W. Hansen, "Tunnel Ionization of quantum-Well Magneto-Excitons Localized in a Lateral Trap", Phys. Rev. B 58, 12980 (1998).
S. Zimmermann, A.O. Govorov, A. Wixforth. C. Rocke, W. Hansen, J.P. Kotthaus, M. Bichler, and W. Wegscheider, "Voltage-Controlled Trapping of Excitons and Storage of Light in Lateral Superlattices", Physica E 2, 35 (1998).
B.T. Miller, W. Hansen, S. Manus, R.J. Luyken, A. Lorke, J.P.Kotthaus, G. Medeiros-Ribeiro, P.M. Petroff, "Fine Structure in the Spectrum of the Few-Electron Ground States of Self-Assembled Quantum Dots", Physica B 249-251, 257 (1998).
V.T. Dolgopolov, A.A. Shashkin, A.V. Aristov, D. Schmerek, W. Hansen, J.P. Kotthaus, and M. Holland, "Nonlinear screening, and spin and cyclotron gaps in the 2D electron gas of GaAs/AlGaAs heterojunctions", Physics-Uspekhi, Advances in Physical Sciences 41, 138 (1998).
W. Hansen, D. Schmerek, C. Steinebach, "Ground States in One-Dimensional Electron Systems", Physics-Uspekhi, Advances in Physical Sciences 41, 175 (1998).
G. Biese, E. Ulrichs, L. Rolf, C. Schüller, C. Steinebach, S. Bargstädt-Franke, Ch. Heyn, D. Heitmann, and K. Eberl, "Edge spin-density modes in quantum dots in a magnetic field", Physica E 2, 619 (1998).
Ch. Nacke, W. Bathe, F. Kieseling, M. Seemann, H. Stolz, Ch. Heyn, S. Bargstädt-Franke, W. Hansen, and D. Heitmann, "Phase sensitive resonant ultrafast reflection from GaAs quantum wells", Phys. Stat. Sol. (b) 206, 307 (1998).
I. Meinel, D. Grundler, S. Bargstädt-Franke, Ch. Heyn, and D. Heitmann, "SQUID-Susceptometry up to 10 Tesla: An improved Method for Magnetization studies on a Two-dimensional Electron System", Appl. Supercond. 5, 161 (1998).
S. Zimmermann, A.O. Govorov, W. Hansen, J.P. Kotthaus, M. Bichler, and W. Wegscheider, "Lateral superlattices as voltage-controlled traps for excitons", Phys. Rev. B 56, 13414 (1997).
B. T. Miller, W. Hansen, S. Manus, R.J. Luyken, A. Lorke, J.P. Kotthaus. S. Huant, G. Medeiros-Ribeiro and P.M. Petroff, "Few-electron ground states of charge-tunable self-assembled quantum dots", Phys. Rev. B 56, 6764 (1997).
V. T. Dolgopolov, A. A. Shashkin, A. V. Aristov, D. Schmerek, W. Hansen, J. P. Kotthaus, and M. Holland, "Direct Measurement of the Spin Gap in the Two-Dimensional Electron Gas of AlGaAs-GaAs Heterojunctions", Phys. Rev. Lett. 79, 729 (1997).
W. Frank, A. O. Govorov, J. P. Kotthaus, C. Steinebach, V. Gudmundsson, W. Hansen, and M. Holland, "Magnetoplasmon mode in connected quantum wire pairs", Phys. Rev. B 55, R1950 (1997).
D. Schmerek, S. Manus, A. O. Govorov, W. Hansen, J. P. Kotthaus, and M. Holland, "Capacitance Spectroscopy of Compressible and Incompressible Stripes in a Narrow Electron Channel", Superlattices and Microstructures 21, 131 (1997).
F. Rademacher, H. Eggers, T. O. Wiegard, C. Schüller, S. Bargstädt-Franke, Ch. Heyn, K. Eberl, and D. Heitmann, "Magneto-Optical Investigation of Excitons in Narrow GaAs-AlGaAs Quantum Wires", Phys. Stat. Sol. (a) 164, 325 (1997).
I. Meinel, D. Grundler, S. Bargstädt-Franke, Ch. Heyn, D. Heitmann, and B. David, "High-sensitive superconducting magnetometry on a two-dimensional electron gas up to 10 Tesla", Appl. Phys. Lett. 70, 3305 (1997).
Ch. Heyn, T. Franke, and R. Anton, "Correlation between island-formation kinetics, surface roughening, and RHEED oscillation damping during GaAs homoepitaxy", Phys. Rev. B 56, 13483 (1997).
Ch. Heyn, and M. Harsdorff, "Simulation of GaAs growth and surface recovery with respect to gallium and arsenic surface kinetics", Phys. Rev. B 55, 7043 (1997).
Ch. Heyn and M. Harsdorff, "Routine measurement of the absolute As4 flux in a molecular beam epitaxy system with conventional RHEED equipment", Appl. Surf. Sci. 100/101, 494 (1996).
A. O. Govorov, W. Hansen, and J. P. Kotthaus, "Voltage Tunable Bragg Reflector Based on the Quantum Confined Stark Effect", Journ. Appl. Phys. 80, 7151 (1996).
W. Frank, W. Hansen, A. O. Govorov, J. P. Kotthaus, and M. Holland, "New Plasmon Mode in Coupled Quantum Wires in High Magnetic Fields", in Proc. 12th Int. Conf. on The Application of High Magnetic Fields in Semiconductor Physics, Würzburg 1996.
D. Schmerek, S. Manus, A. O. Govorov, W. Hansen, J. P. Kotthaus, and M. Holland, "Compressible and Incompressible Stripes in Narrow Electron Channel", Phys. Rev. B 54, 13816 (1996).
V. T. Dolgopolov, A. A. Shashkin, A. V. Aristov, D. Schmerek, W. Hansen, H. Drexler, J. P. Kotthaus, and M. Holland, "Thermodynamic Density of States of a Two-Dimensional Electron System in High Magnetic Fields", in The Physics of Semiconductors, eds. M. Scheffler and R. Zimmermann, (World Scientific, Singapore 1996) p. 2307.
V. T. Dolgopolov, A. A. Shashkin, A. V. Aristov, D. Schmerek, H. Drexler, W. Hansen, J. P. Kotthaus, and M. Holland, "Nonlinear Screening in Two-Dimensional Electron Systems", Phys Low-Dim. Struct. 6, 1 (1996).
W. Hansen, D. Schmerek, and H. Drexler, "Quantum Wires and Quantum Dots in Heterojunction Devices with Field-Effect Electrodes", Proceedings of the 7th Brasilian Workshop on Semiconductor Physics, Brazilian Journal of Physics 26, 110 (1996).
W. Hansen and H. Drexler, "Spectroscopy on Field-Effect Induced Quantum Wires and Quantum Dots", in Festkörperprobleme, Advances in Solid State Physics, Vol. 35, ed. R. Helbig, (Vieweg, Braunschweig/Wiesbaden 1996) p.81-101.
J. P. Kotthaus, W. Hansen, and D. A. Wharam, "Electronic Interactions Between Quantum Dots", Physica B 227, 1 (1996).
A.P.Förster, W. Hansen, A. Schmeller, J.P. Kotthaus, W. Klein, G. Böhm, G. Tränkle, and G. Weimann, "Modulation-assisted Raman scattering of plasmons in field-effect induced potential superlattices", in Highlights of Light Spectroscopy on Semiconductors, HOLSOS 95, Eds.: A. D'Andrea, L.G. Quagliano, S. Selci, (Singapore: World Scientific, 1996) p. 183.
C. Lettau, W. Hansen, J. P. Kotthaus, A. Lorke, A. C. Gossard, and J. H. English, "High Frequency Conductivity of Ion-Beam-Defined Quantum Wires with Self-Aligned Gate", Semiconductor Science and Technology 10, 865-869 (1995).
V. T. Dolgopolov, H. Drexler, W. Hansen, J. P. Kotthaus and M. Holland, "Electron Correlations and Coulomb Gap in a Two-Dimensional Electron Gas in High Magnetic Fields", Phys. Rev. B 51, 7958 (1995).
D. Leondard, G. Medeiros-Ribeiro, H. Drexler, K. Pond, W. Hansen, J. P. Kotthaus, and P. M. Petroff, "Progress in Self-Assembled Quantum Dots of InGaAs on GaAs", Proc. of the 21st Intern. Symposium on Compound Semiconductors, ed. H. Goronkin and U. Mishra, (IOP Publishing, Bristol 1995) p.819.
H. Drexler, D. Leonard, W. Hansen, J. P. Kotthaus, P. M. Petroff, "Spectroscopy on Charge Tunable InGaAs Quantum Dots with Few Electrons", Proc. 22nd Int. Conf. on The Physics of Semiconductors, ed. D. J. Lockwood, (World Scientific, Singapore 1995) p.1867.
A. Schmeller, A. Govorov, W. Hansen, J. P. Kotthaus, W. Klein, G. Böhm, G. Tränkle, and G. Weimann, "Excitons in Controlled Potential Landscapes", Proc. 22nd Int. Conf. on The Physics of Semiconductors, ed. D. J. Lockwood, (World Scientific, Singapore 1995) p.1727.
A. Schmeller, A. Koll, Ch. Peters, W. Hansen, J. P. Kotthaus, G. Böhm, G. Tränkle, and G. Weimann, "In-Plane Electro-Optic Effect in a Quantum Well", in Confined Electrons and Photons: New Physics and Applications, eds. E. Burstein and C. Weisbuch, NATO ASI-Series B, Vol. 340, (Plenum, New York 1995) p. 765.
Ch. Heyn and M. Harsdorff, "Simultaneous reflection high energy electron diffraction oscillations and mass spectroscopy investigations during molecular beam epitaxy of (001) GaAs - smooth surfaces or stoichiometric films ?", Proceedings of the 8th international Conference on Molecular Beam Epitaxy, Osaka / Japan, (1995) J. Crystal Growth 150, 117 (1995).
H. Drexler, W. Hansen, S. Manus, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "Quantum Wires in the One-Dimensional Quantum Limit", Proc. 185th Meeting of the Electrochemical Society, San Francisco 1994.
H. Drexler, D. Leonard, W. Hansen, J. P. Kotthaus, and P. M. Petroff, "Spectroscopy of Quantum Levels in Charge-Tunable InGaAs Quantum dots", Phys. Rev. Lett. 73, 2252 (1994).
H. Drexler, W. Hansen, S. Manus, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "Quantum Wires with a Widely Tunable Confining Potential", Physica Scripta T 55, 65 (1994).
W. Hansen, A. Schmeller, H. Drexler, J. P. Kotthaus, M. Holland, G. Tränkle, G. Böhm, and G. Weimann, "Spectroscopy on Field-Effect Induced Superlattices", Proceedings of the 8th International Winterschool on New Developments in Solid State Physics: Interaction and Scattering Phenomena in Nanostructures, Semicond. Sci. Technol. 9, 1946 (1994).
C. Lettau, M. Wendel, A. Schmeller, W. Hansen, J. P. Kotthaus, G. Böhm, G. Tränkle, G. Weimann, and M. Holland, "DC- and High Frequency-Transport in Quasi-1D Quantum Wires with Rough Boundaries", Phys. Rev. B 50, 2432-2442 (1994).
H. Drexler, W. Hansen, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "Far-Infrared Photocurrent of Quantum Wires", Appl. Phys. Lett. 64, 2270 (1994).
H. Drexler, W. Hansen, S. Manus, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "One-Dimensional Electron Channels in the Quantum Limit", Phys. Rev. B 49, 14074 (1994).
A. Schmeller, W. Hansen, J. P. Kotthaus, G. Tränkle, and G. Weimann, "Franz-Keldysh Effect in a Two-Dimensional System", Appl. Phys. Lett. 64, 330-332 (1994).
K. Ensslin, W. Hansen, and J. P. Kotthaus, "Electron Motion in Lateral Superlattices on Semiconductors", in Molecular Electronics Handbook, eds. G. Mahler, V. May, and M. Schreiber, (Dekker, New York, 1994) p. 143-170.
C. Lettau, M. Wendel, A. Schmeller, W. Hansen, J. P. Kotthaus, G. Böhm, G. Weimann, and M. Holland, "Comparison of Far-Infrared- and DC-Conductivity of Electron-Systems Laterally Patterned by Low-Energy Ion Beam Exposure", Solid State Electronics 37, 1207-1210 (1994).
G. Hertel, H. Drexler, W. Hansen, A. Schmeller, J.P. Kotthaus, M. Holland, and S. P. Beaumont, "Widely Tuneable Quantum Wire Arrays in MISFET-type Heterojunctions with a Stacked Gate", Solid State Electronics 37, 1289-1292 (1994).
K. Ensslin, W. Hansen, and J. P. Kotthaus "Transport and Infrared Properties of Lateral Superlattices", Proc. Nanoelectronics Symposium, Esprit Conf. 92, (Springer, 1994) in Druck.
C. Peters, W. Hansen, J. P. Kotthaus, and M. Holland "Optical properties of quantum wells with a field-effect-induced lateral superlattice", Proceedings of the Third International Conference on Optics in Confined Systems, Montpellier 1993, Journal de Physique IV, Vol. 3, 123 (1993).
Ch. Heyn and M. Harsdorff, "Flux control and calibration of an As effusion cell in a molecular beam epitaxy system for GaAs and AlGaAs with a quadrupole mass spectrometer", J. Crystal Growth 133, 241 (1993).
M. Wendel, C. Lettau, W. Hansen, V. Dolgopolov, G. Böhm, and G. Weimann, "Interacting Edge States in Quantum Wires", Solid State Comm. 87, 1101 (1993).
H. Drexler, W. Hansen, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "Non-parabolic confinement in quantum wire superlattices", Phys. Rev. B 46, 12849 (1992).
W. Hansen, H. Drexler, J. P. Kotthaus, M. Holland, and S. P. Beaumont, "Nonlocality in the Dispersion of Dimensional Resonances in quantum Wires", in Physics of Semiconductors, eds. P. Jiang and H. Z. Zheng (World Scientific, Singapore, 1992) p. 1330.
H. Drexler, W. Hansen, J. P. Kotthaus, M. Holland, and S. P. Beaumont "Transport Studies and Infrared Spectroscopy on AlAs/GaAs MIS-Heterojunctions without Dopants in the Barrier", Semicond. Sci. Technol. 7, 1008 (1992).
W. Hansen, J. P. Kotthaus, and U. Merkt, "Electrons in Laterally Periodic Nanostructures", in Semiconductors and Semimetals Vol. 35 , eds. Willardson, Beer, and Weber, Volume ed. M. A. Reed, (Academic Press, San Diego 1992) pp. 279-380.
W. Hansen, "Experiments on Lateral Superlattices", in Physics of Nanostructures, eds. J. H. Davies and D. A. Long (SUSSP, 1991) pp. 257-297.
W. Hansen, "Spectroscopy on Laterally Confined Electron Systems", in Quantum Coherence in Mesoscopic Systems, ed. B. Kramer (Plenum Press, New York 1991) pp. 23-44.
W. Hansen, T. P. Smith, III, K. Y. Lee, J. M. Hong, and C. M. Knoedler, "Fractional States in Few Electron Systems", Appl. Phys. Lett. 56, 168 (1990).
W. Hansen, T. P. Smith, III, J. Piao, R. Beresford, and W. I. Wang, "Magnetoresistance Measurement of Doping Symmetry and Strain Effects in GaSb-AlSb Quantum Wells", Appl. Phys. Lett. 56, 81 (1990).
W. Hansen, T. P. Smith III, D. P. DiVincenzo, K. Y. Lee, Y. H. Lee, and R. Cheung, "Quantum Fluctuations in n+ GaAs Wires with Invasive Probes", Surf. Sci. 229, 321 (1990).
T. P. Smith, III; H. Arnot, J. A. Brum, L. L. Chang, L. Esaki, A. B. Fowler, W. Hansen, J. M. Hong, D. P. Kern, C. M. Knoedler, S. E. Laux, K. Y. Lee, "Quantum-state spectroscopy in quantum wires and quantum dots", in Science and engineering of one- and zero-dimensional semiconductors, eds. S. P. Beaumont, C. M. Sotomayor Torres, (Plenum Press, N. Y. 1990) pp. 33-39.
K. Y. Lee, W. Hansen, T. P. Smith, III, C. M. Knoedler, J. M. Hong, and D. P. Kern, "Fabrication of GaAs/GaAlAs transport devices using a deep submicron trench etching technique", J. Vac. Sci. Technol. B 7, 1819 (1989).
W. Hansen, T. P. Smith, III, J. A. Brum, J. M. Hong, K. Y. Lee, C. M. Knoedler, D. P. Kern, and L. L. Chang, "Magnetic Effects in Quantum Dots", in Nanostructures Physics and Fabrication, eds. M. A. Reed and W. P. Kirk, (Academic Press, Boston, 1989) pp. 97-105.
K. Y. Lee, T. P. Smith, III, C. J. B. Ford, W. Hansen, C. M. Knoedler, J. M. Hong, and D. P. Kern, "Submicron Trenching of Semiconductor Nanostructures", Appl. Phys. Lett. 55, 625 (1989).
W. Hansen, T. P. Smith, III, K. Y. Lee, J. A. Brum, C. M. Knoedler, J. M. Hong, and D. P. Kern, "Zeeman Bifurcation of Quantum-Dot Spectra", Phys. Rev. Lett. 62, 2168 (1989).
W. Hansen "Quasi-One-Dimensional Electron Systems on GaAs/AlGaAs Heterojunctions", in Festkörperprobleme, Advances in Solid State Physics Vol. 28, ed. U. Rössler, (Vieweg, Braunschweig, 1988) pp. 121-140.
W. Hansen and J. P. Kotthaus "Quasi-One-Dimensional Electron Channels in AlGaAs/GaAs-Heterojunctions", in "Physics and Technology of Submicron Structures", eds. H. Heinrich, G. Bauer, and F. Kuchar (Springer, Berlin Heidelberg,1988) pp. 187-197.
F. Brinkop, W. Hansen, J. P. Kotthaus, and K. Ploog, "One-dimensional Subbands of Narrow Electron Channels in Gate AlGaAs/GaAs Heterojunctions", Phys. Rev. B 37, 6547 (1988).
J. P. Kotthaus, W. Hansen, H. Pohlmann, M. Wassermeier, and K. Ploog, "Intersubband Resonances in Quasi-One-Dimensional Channels", Surf. Sci. 196, 600 (1988).
W. Hansen, M. Horst, J.P. Kotthaus, U. Merkt, Ch. Sikorski, and K. Ploog, "Intersubband Resonance in Quasi-One-Dimensional Inversion Channels", Phys. Rev. Lett. 58, 2586 (1987).
W. Hansen, J.P. Kotthaus, A. Chaplik , and K. Ploog, "Electronic Excitations in Laterrally Microstructured AlGaAs-Heterostructures", in: High Magnetic Fields in Semiconductor Physics, ed. G. Landwehr (Springer, Heidelberg 1987) pp. 266-269.
F. Thiele, W. Hansen, M. Horst, J.P. Kotthaus, J. C. Maan, U. Merkt, K. Ploog, G. Weimann, and A.D. Wieck "Cyclotron Resonance in n-GaAs/AlGaAs Heterojunctions", in High Magnetic Fields in Semiconductor Physics, ed. G. Landwehr (Springer, Heidelberg 1987) pp. 252-255.
E. Batke, W. Hansen, D. Heitmann, J.P. Kotthaus, U. Mackens, L. Prager, and K. Ploog, "Lateral Structures of Submicron Periodicity on Si-MIS-Systems and AlGaAs-GaAs-Heterojunctions", in Semiconductors, Quantum Well Structures and Superlattices, eds. K. Ploog and N.T. Linh, (Edition de Physique, Les Ulis, 1986) pp. 155-160.
W. Hansen, U. Merkt, and J.P. Kotthaus, "Localization of Inversion Electrons on InP", Surf. Sci. 142, 52 (1984)
W. Hansen, M. Horst, J.P. Kotthaus, U. Merkt, Ch. Sikorski, and K. Ploog, "''Intersubband Resonance in n Electrons on InP", Surf. Sci. 142, 52 (1984).