AG Lorke

Veröffentlichungen der Arbeitsgruppe

2012

	A. Sharma, B.P. Singh, S. Dhar, A. Gondorf, M. Spasova "Effect of surface groups on the luminescence property of ZnO nanoparticles synthesized by sol–gel route" Surface Science 606 (2012) L13–L17
	T. Nowozin, A. Marent, D. Bimberg, A. Beckel, B. Marquardt, A. Lorke, and M. Geller "Time-resolved detection of many-particle hole states in InAs/GaAs quantum dots using a two-dimensional hole gas up to 77 K" phys. stat. sol. C 9, No. 2, 243–246 (2012)

2011

	E. V. Deviatov, A. Ganczarczyk, A. Lorke, G. Biasiol, and L. Sorba "Quantum Hall Mach-Zehnder interferometer far beyond equilibrium" Phys. Rev. B 84, 235313 (2011)
	Christoph Gutsche, Andrey Lysov, Daniel Braam, Ingo Regolin, Gregor Keller, Zi-An Li, Martin Geller, Marina Spasova, Werner Prost, and Franz-Josef Tegude "n-GaAs/InGaP/p-GaAs Core-Multishell Nanowire Diodes for Efficient Light-to-Current Conversion" Adv. Funct. Mater. 2011, XX, 1–8
	G. Schierning, R. Theissmann, N. Stein, N. Petermann, A. Becker, M. Engenhorst, V. Kessler, M. Geller, A. Beckel, H. Wiggers, and R. Schmechel "Role of oxygen on microstructure and thermoelectric properties of silicon nanocomposites" J. Appl. Phys. 110, 113515 (2011)
	Andrey Lysov, Sasa Vinaji, Matthias Offer, Christoph Gutsche, Ingo Regolin, Wolfgang Mertin, Martin Geller, Werner Prost, Gerd Bacher und Franz-Josef Tegude "Spatially Resolved Photoelectric Performance of Axial GaAs Nanowire pn-Diodes" Nano Res. 4, 987 (2011)
	Bastian Marquardt, Andreas Beckel, Axel Lorke, Andreas D. Wieck, Dirk Reuter, and Martin Geller "The influence of charged InAs quantum dots on the conductance of a two-dimensional electron gas: Mobility vs. carrier concentration" Appl. Phys. Lett. 99, 223510 (2011)
	Christian Notthoff, Dirk Reuter, Andreas D. Wieck, and Axel Lorke "Edge-induced magnetoplasmon excitation in a two-dimensional electron gas under quantum Hall conditions " Phys. Rev. B 84, 035311 (2011)
	T. Nowozin, A. Marent, G. Hönig, A. Schliwa, D. Bimberg, A. Beckel, B. Marquardt, A. Lorke, and M. Geller "Time-resolved high-temperature detection with single charge resolution of holes tunneling into many-particle quantum dot states" Phys. Rev. B 84, 075309 (2011)
	E. V. Deviatov, A. Lorke, G. Biasiol, and L. Sorba "Energy Transport by Neutral Collective Excitations at the Quantum Hall Edge" Phys. Rev. Lett. 106, 256802 (2011)
	A. Gondorf, M. Geller, J. Weißbon, and A. Lorke "Mobility and carrier density in nanoporous indium tin oxide films" Phys. Rev. B 83, 212201 (2011)
	Anoop Gupta, Ahmed S. G. Khalil, Matthias Offer, Martin Geller, Markus Winterer, Axel Lorke, and Hartmut Wiggers "Synthesis and Ink-Jet Printing of Highly Luminescing Silicon Nanoparticles for Printable Electronics" J. Nanosci. Nanotechnol. 2011, Vol. 11, No. 6
	B. Marquardt, M. Geller, B. Baxevanis, D. Pfannkuche, A. D. Wieck, D. Reuter & A. Lorke "Transport spectroscopy of non-equilibrium many-particle spin states in self-assembled quantum dots" NATURE Commun. 2, 209 (2011)
	A. Lysov , M. Offer, C. Gutsche, I. Regolin, S. Topaloglu, M. Geller, W. Prost and F.-J. Tegude "Optical properties of heavily doped GaAs nanowires and electroluminescent nanowire structures" Nanotechnology 22 (2011) 085702
	A. Ganczarczyk, M. Geller and A. Lorke "XeF2 gas-assisted focused-electron-beam-induced etching of GaAs with 30 nm resolution" Nanotechnology 22 (2011) 045301

2010

	J. Nannen, T. Kümmell, M. Bartsch, K. Brunner, and G. Bacher "Ultrafast electrical charging and discharging of a single InGaAs quantum dot" Appl. Phys. Lett. 97, 173108 (2010)
	Wen Lei, Christian Notthoff, Jie Peng, Dirk Reuter, Andreas Wieck, Gabriel Bester, and Axel Lorke "‘‘Artificial Atoms’’ in Magnetic Fields: Wave-Function Shaping and Phase-Sensitive Tunneling" - featured in NATURE Materials 10, 173 (2011) Phys. Rev. Lett. 105, 176804 (2010)
	Jens Theis, Martin Geller, Axel Lorke, Hartmut Wiggers, Andreas Wieck and Cedrik Meier "Electroluminescence from silicon nanoparticles fabricated from the gas phase" Nanotechnology 21 (2010) 455201
	Karoline A. Piegdon, Matthias Offer, Axel Lorke, Martin Urbanski, Andreas Hoischen, Heinz-S. Kitzerow, Stefan Declair, Jens Forstner, Torsten Meier, Dirk Reuter, Andreas D. Wieck, Cedrik Meier "Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator" Physica E 42 (2010) 2552–2555
	E. V. Deviatov, A. Lorke, G. Biasiol, L. Sorba, and W. Wegscheider "Local Investigation of the Energy Gap within the Incompressible Strip in the Quantum Hall Regime" JETP Letters, Vol. 92, No. 1, pp. 67–70 (2010)
	Bastian Marquardt, Martin Geller, Axel Lorke, Dirk Reuter und Andreas D. Wieck "A two-dimensional electron gas as a sensitive detector to observe the charge carrier dynamics of self-assembled QDs" Physica E 42 (2010) 2598–2601
	M. Geller, B. Marquardt, A. Lorke, D. Reuter und A. D. Wieck "A Two-Dimensional Electron Gas as a Sensitive Detector for Time-Resolved Tunneling Measurements on Self-Assembled Quantum Dots" Nanoscale Res. Lett. 5, 829 (2010)
	Karoline A. Piegdon, Stefan Declair, Jens Förstner, Torsten Meier, Heiner Matthias, Martin Urbanski, Heinz-S. Kitzerow, Dirk Reuter, Andreas D. Wieck, Axel Lorke, and Cedrik Meier "Tuning quantum-dot based photonic devices with liquid crystals" Optics Express, Vol. 18, Issue 8, pp. 7946-7954 (2010)
	C. Notthoff, A. Lorke, K. Rachor, D. Heitmann, and D. Reuter "THz-Photoconductivity of Quantum Hall Systems in Quasi-Corbino-Geometry" J. Low Temp. Phys. 159, 193 (2010)
	A. Ganczarczyk, S. Voßen, M. Geller, A. Lorke, D. Reuter, A.D. Wieck "A voltage-tunable in-plane diode in a two-dimensional-electron system" Physica E 42 (2010) 1216–1219
	W. Lei, C. Notthoff, A. Lorke, D. Reuter, and A. D. Wieck "Electronic structure of self-assembled InGaAs/GaAs quantum rings studied by capacitance-voltage spectroscopy" Appl. Phys. Lett. 96, 033111 (2010)
	G. Jnawali, Th. Wagner, H. Hattab, R. Möller, A. Lorke, and M. Horn-von Hoegen "Two-Dimensional Electron Transport and Scattering in Bi(111) Surface States" e-J. Surf. Sci. Nanotech. Vol. 8 (2010) 27-31

2009

	Christian Notthoff, Kevin Rachor, Detlef Heitmann, and Axel Lorke "Terahertz photoresponse of a quantum Hall edge-channel diode" Phys. Rev. B 80, 205320 (2009)
	Wen Lei, Christian Notthoff, Matthias Offer, Cedrik Meier, Axel Lorke, Chennupati Jagadish, and Andreas D. Wieck "Electron energy structure of self-assembled In(Ga)As nanostructures probed by capacitance-voltage spectroscopy and one-dimensional numerical simulation" J. Mater. Res., Vol. 24, No. 7, Jul 2009
	B. Marquardt, M. Geller, A. Lorke, D. Reuter, and A. D. Wieck "Using a two-dimensional electron gas to study nonequilibrium tunneling dynamics and charge storage in self-assembled quantum dots" Appl. Phys. Lett. 95, 022113 (2009)
	S. Akcöltekin, M. El Kharrazi, B. Köhler, A. Lorke, and M. Schleberger "Graphene on insulating crystalline substrates" Nanotechnology 20 (2009) 155601 (6pp)
	E.V. Deviatov, B. Marquardt, A. Lorke, G. Biasiol, and L. Sorba "Interference effects in transport across a single incompressible strip at the edge of the fractional quantum Hall system" Phys. Rev. B 79, 125312 (2009)
	Cedrik Meier, Stephan Lüttjohann, Matthias Offer, Hartmut Wiggers, and Axel Lorke "Silicon Nanoparticles: Excitonic Fine Structure and Oscillator Strength" Advances in Solid State Physics 48, 79 (2009)

2008

	E. V. Deviatov, A. Lorke, and W. Wegscheider "Manifestation of a complex edge excitation structure in the quantum Hall regime at high fractional filling factors" Phys. Rev. B 78, 035310 (2008)
	W. Lei, M. Offer, A. Lorke, C. Notthoff, C. Meier, O. Wibbelhoff, and A. D. Wieck "Probing the band structure of InAs/GaAs quantum dots by capacitance-voltage and photoluminescence spectroscopy" Appl. Phys. Lett. 92, 193111 (2008)
	Karoline A. Piegdon, Heinrich Matthias, Cedrik Meier, and Heinz-S. Kitzerow "Tunable optical properties of photonic crystals and semiconductor microdisks using liquid crystals" Proc. SPIE 6911 (2008)
	Bastian Marquardt, Marco Russ, Axel Lorke, Cedrik Meier, Dirk Reuter, Andreas D. Wieck "Quantum dots as tunable scatterers for 2D- and 1D-electron systems" Physica E 40 (2008) 2075-2077
	W. Lei, O. Wibbelhoff, C. Notthoff, B. Marquardt, D. Reuter, A.D. Wieck, A. Lorke "Magnetic-field-induced modification of the wave-functions in InAs quantum dots" Physica E 40 (2008) 1870-1872
	E. V. Deviatov and A. Lorke "Experimental realization of a Fabry-Perot-type interferometer by copropagating edge states in the quantum Hall regime" Phys. Rev. B 77, 161302(R) (2008)
	C. Notthoff, A. Lorke, D. Reuter "High sensitivity far-infrared detection by resonant inter-Landau-level scattering" Physica E 40 (2008) 1328-1331
	E.V. Deviatov, V.T. Dolgopolov, A. Lorke, D. Reuter, A.D. Wieck "Transport across the incompressible strip in the fractional quantum Hall effect regime" Physica E 40 (2008) 1232-1234
	E.V. Deviatov and A. Lorke "Separately contacted edge states at high imbalance in the integer and fractional quantum Hall effect regime" phys. stat. sol. (b) 245, No. 2, 366-377 (2008)

2007

	T. P. Huelser, A. Lorke, P. Ifeacho, H. Wiggers, and C. Schulz "Core and grain boundary sensitivity of tungsten-oxide sensor devices by molecular beam assisted particle deposition" J. Appl. Phys. 102, 124305 (2007)
	G. Bester, D. Reuter, Lixin He, A. Zunger, P. Kailuweit, A. D. Wieck, U. Zeitler, J. C. Maan, O. Wibbelhoff, and A. Lorke "Experimental imaging and atomistic modeling of electron and hole quasiparticle wave functions in InAs/GaAs quantum dots" Phys. Rev. B 76, 075338 (2007)
	S. Lüttjohann, C. Meier, M. Offer, A. Lorke and H. Wiggers "Temperature-induced crossover between bright and dark exciton emission in silicon nanoparticles" Europhys. Lett. 79, 37002 (2007)
	Cedrik Meier, Andreas Gondorf, Stephan Lüttjohann, and Axel Lorke "Silicon nanoparticles: Absorption, emission, and the nature of the electronic bandgap" J. Appl. Phys. 101, 103112 (2007)
	W. Lei, Y.L. Wang, Y.H. Chen, P. Jin, X.L. Ye, B.Xu, and Z.G. Wang "Effect of substrate misorientation on the InAs/InAlAs/InP nanostructure morphology and lateral composition modulation in the InAlAs matrix" Appl. Phys. Lett. 90, 103118 (2007)
	E.V. Deviatov, A.A. Kapustin, V.T. Dolgopolov, A. Lorke, D. Reuter and A.D. Wieck "Evidencs for the Luttigger liquid density of states in transport across the incompressible stripe at fractional filling factors" Europhys. Lett. 77 (2007), 37002
	I. Regolin, D. Sudfeld, S. Lüttjohann, V. Khorenko, W. Prosta J. Kästner, G. Dumpich, C. Meier, A. Lorke, F.-J. Tegude "Growth and characterisation of GaAs/InGaAs/GaAs nanowhiskers on (111) GaAs" J. Crystal Growth 298 (2007) 607-611

2006

	D. Reuter, P. Kailuweit, R. Roescu, A.D. Wieck, O.S. Wibbelhoff, A. Lorke, U. Zeitler, and J.C. Maan "Hole and electron wave functions in self-assembled InAs quantum dots: a comparison" phys. stat. sol. (b), 243, No. 15, 3942-3945 (2006)
	B. Sahoo, W. A. Adeagbo, F. Stromberg, W. Keune, E. Schuster, R. Peters, P. Entel, S. Lüttjohann, A. Gondorf, W. Sturhahn, J. Zhao, T. S. Toellner and E. E. Alp "Electronic transport and atomic vibrational properties of semiconducting Mg2119Sn thin film" Phase Transitions 79, 9-10 (2006), 839-852
	M. Russ, C. Meier, B. Marquardt, A. Lorke, D. Reuter and A. D. Wieck "Quantum dot electrons as controllable scattering centers in the vicinity of a two-dimensional electron gas" Phase Transitions, 79, 9-10 (2006), 765-770
	E.V. Deviatov, A.A. Kapustin, V.T. Dolgopolov, A. Lorke, D. Reuter "Equilibration between edge states in the fractional quantum Hall effect regime at high imbalances" Phys. Rev. B 74, 073303 (2006)
	Cedrik Meier, Stephan Lüttjohann, Vasyl G. Kravets, Hermann Nienhaus, Axel Lorke, Pascal Ifeacho, Hartmut Wiggers, Christof Schulz, Marcus K. Kennedy and F. Einar Kruis "Vibrational and defect states in SnOx nanoparticles" J. Appl. Phys. 99, 113108 (2006)
	P. Kailuweit, D. Reuter, A.D. Wieck, O. Wibbelhoff, A. Lorke, U. Zeitler, J.C. Maan "Mapping of the hole wave functions of self-assembled InAs-quantum dots by magneto-capacitance-voltage spectroscopy" Physica E 32 (2006) 159-162
	T. P. Huelser, H. Wiggers, P. Ifeacho, O. Dmitrieva, G. Dumpich and A. Lorke "Morphology, structure and electrical properties of iron nanochains" Nanotechnology 17 (2006) 3111
	Thorsten Müller, Axel Lorke, Dirk Reuter "Charge pumping in driven electron ratchets" Physica E 32 (2006) 528
	H. Nienhaus, V. Kravets, S. Koutouzov, C. Meier, A. Lorke, H. Wiggers, M. K. Kennedy and F. E. Kruis "Quantum size effect of valence band plasmon energies in Si and SnOx nanoparticles" J. Vac. Sci. Technol. B 24(3), 2006
	M. Russ, C. Meier, A. Lorke, D. Reuter and A.D. Wieck "Role of quantum capacitance in coupled low-dimensional electron systems" Phys. Rev. B 73, 115334 (2006)
	S. Strauf, M.T. Rakher, I. Carmeli, K. Hennessy, C. Meier, A. Badolato, M.J.A. DeDood, P.M. Petroff, E.L. Hu, E.G. Gwinn, and D. Bouwmeester "Frequency control of photonic crystal membrane resonators by monolayer deposition" Appl. Phys. Lett. 88, 043116 (2006)
	Cedrik Meier, Stephan Lüttjohann, Vasyl G. Kravets, Hermann Nienhaus, Axel Lorke and Hartmut Wiggers "Raman properties of silicon nanoparticles" Physica E 32, 155-158 (2006)
	Cedrik Meier, Kevin Hennessy, Elaine D. Haberer, Rajat Sharma, Yong-Seok Choi, Kelly McGroddy, Stacia Keller, Steven P. DenBaars, Shuji Nakamura, and Evelyn L. Hu "Visible resonant modes in GaN-based photonic crystal membrane cavities" Appl. Phys. Lett 88, 031111 (2006)

2005

	E.V. Deviatov, V.T. Dolgopolov, A. Lorke, W. Wegscheider, and A.D. Wieck "Experimental Investigation of the Edge States Structure at Fractional Filling Factors" JETP Letters 82, 8 (2005)
	T. Müller, A. Lorke, Q.T. Do, F.J. Tegude, D. Schuh d, W. Wegscheider "A three-terminal planar selfgating device for nanoelectronic applications" Solid-State Electronics 49 (2005) 1990-1995
	S. Lüttjohann, C. Meier, A. Lorke, D. Reuter, and A.D. Wieck "Screening effects in InAs quantum-dot structures observed by photoluminescence and capacitance-voltage spectra Appl. Phys. Lett. 87 163117 (2005)
	E.V.Deviatov, V.T.Dolgopolov, A.Würtz, A.Lorke, A.Wixforth, W.Wegscheider, K.L.Campman, A.C.Gossard "Topological defects in the edge-state structure in a bilayer electron system" Physical Review B 72, 041305(R) (2005)
	A.Würtz, T.Müller, A.Lorke, D.Reuter, A.D.Wieck "Electrical Readout of the Local Nuclear Polarization in the Quantum Hall Effect: A Hyperfine Battery" Physical Review Letters 95, 056802 (2005)
	T.Müller, A.Würtz, A. Lorke "Wave-form sampling using a given electron ratchet in a two-dimensional electron system" Appl. Phys. Lett. 87, 042104 (2005)
	M.K.Kennedy, F.E.Kruis, H.Fissan, H.Nienhaus, A. Lorke, T.H.Metzger "Effect of in-flight annealing and deposition method on gas-sensitive SnOx films made from size-selected nanoparticles" Sensors and Actuators B 109 (2005) 62-69
	T.P.Hülser, H.Wiggers, F.E.Kruis, A.Lorke "Nanostructured gas sensors and electrical characterization of deposited SnO2 nanoparticles in ambient gas atmosphere" Sensors and Actuators B 109 (2005) 13-18
	Vasyl G. Kravets, Cedrik Meier, Denan Konjhodzic, Axel Lorke, and H artmut Wiggers "Infrared properties of silicon nanoparticles" J. Appl. Phys. 97, 084306 (2005)
	Oliver S. Wibbelhoff, Axel Lorke, Dirk Reuter, Andreas D. Wieck "Magnetocapacitance probing of the many-particle states in InAs dots" Appl. Phys. Lett. 86, 092104 (2005)
	D.Reuter, P.Kailuweit, A.D.Wieck, U.Zeitler, O.Wibbelhoff, C.Meier, A.Lorke, and J.C.Maan "Coulomb-Interaction-Induced Incomplete Shell Filling in the Hole System of InAs Quantum Dots" Phys. Rev. Lett. 94, 026808 (2005)

2004

	J.Knipping, H.Wiggers, B.Rellinghaus, P.Roth, D.Konjhodzic, and C.Meier "Synthesis of High Purity Silicon Nanoparticles in a Low Pressure Microwave Reactor" J. Nanosci. Nanotech. 4, 1039 (2004)
	J. Knipping, H.Wiggers, B.F.Kock, T. Hülser, B. Rellinghaus "Synthesis and chracterization of nanowires formed by self-assembled iron particles"" Nanotechnology 15 (2004) 1665-1670
	E.V. Deviatov, A. Würtz, A. Lorke, M.Yu. Melnikov, V.T. Dolgopolov, D. Reuter, and A.D. Wieck "Two relaxation mechanisms observed in transport between spin-split edge states at high imbalance" Phys. Rev. B 69, 115330 (2004)
	E.V. Deviatov, V.T. Dolgopolov, and A. Würtz "Charge Redistribution between Cyclotron-Resolved Edge States" JETP Letters 79, 10 (2004)
	O. Wibbelhoff, C. Meier, A. Lorke, P. Schafmeister, A.D. Wieck "Wave function mapping of self-assembled quantum dots by capacitance spectroscopy" Physica E 21 (2004) 516-520
	S. de Haan, A. Lorke, J.P. Kotthaus, M. Bichler, W. Wegscheider "Quantized transport in ballistic rectifiers: sign reversal and step-like output" Physica E 21 (2004) 916-920
	E.V. Deviatov, A. Würtz, A. Lorke, M.Yu. Melnikov, V.T. Dolgopolov, A. Wixforth, K.L. Campman, A.C. Gossard "Manifestation of the bulk phase transition in the edge energy spectrum in a two dimensional bilayer electron system" JETP Letters 79, 206 (2004)
	M. Russ, A. Lorke, D. Reuter, P. Schafmeister "Self-assembled quantum dots as probes for Landau-level spectroscopy" Physica E 22 (2004) 506-509
	A. Würtz, E. Deviatov, A. Lorke, V.T. Dolgopolov, D. Reuter, A.D. Wieck "Seperately contacted edge states in the fractional quantum Hall regime"" Physica E 22 (2004) 177-180
	S. de Haan, A. Lorke, J.P. Kotthaus, W. Wegscheider, and M. Bichler "Rectification in Mesoscopic Systems with Broken Symmetry: Quasiclassical Ballistic Versus Classical Transport" Phys. Rev. Lett. 92, 56806 (2004)

2003

	A. Lorke, S. Böhm, and W. Wegscheider "Curved two-dimensional electron gases" Superlattices and Microstructures 33 (2003) 347-356
	Quoc-Thai Do, Hans Clemens, Axel Lorke "Coulomb blockade systems fabricated by atomic force microscopy" Proceedings IEEE-Nano 2003, San Francisco, 2 (2003) 774
	Axel Lorke, Jorge M. Garcia, Ralf Blossey, Richard J. Luyken, and Pierre M. Petroff "Self-Organized InGaAs Quantum Rings - Fabrication and Spectroscopy -" Adv. Solid State Phys. 43, 125 (2003)
	R. Ramamoorthy, M.K. Kennedy, H. Nienhaus, A. Lorke, F.E. Kruis, H. Fissan "Surface oxidation of monodisperse SnOx nanoparticles" Sensors and Actuators B 88 (2003) 281-285
	T. Müller and H. Nienhaus "Ultrathin Ag films on H:Si(111)-1x1 Surfaces deposited at low temperatures" J. Appl. Phys. 93, 924 (2003)

2002

	R.J. Luyken, A. Lorke, G. Medeiros Ribeiro, P.M. Petroff "Charging dynamics in vertically aligned InAs quantum dots" Materials Science and Technology 18 (7): 725-728 (2002)
	A. Lorke, R. Blossey, J.M. Garcia, M. Bichler, and G. Abstreiter "Morphological transformation of InyGa1-yAs islands, fabricated by Stranski-Krastanov growth" Mat.Sci.Eng. B 88, (2002)
	A. Würtz, R. Wildfeuer, A. Lorke, E.V. Deviatov, and V.T. Dolgopolov "Separately contacted edge states: A spectroscopic tool for the investigation of the quantum Hall effect" Phys. Rev. B 65, 075303 (2002)
	R. Blossey and A. Lorke "Wetting droplet instability and quantum ring formation" Phys. Rev. E 65, 021603 (2002)

2001

	R.J. Warburton, C. Schäflein, D. Haft, F. Bickel, A. Lorke, K. Karrai, J.M. Garcia, W. Schoenfeld, P.M. Petroff "Optical emission from single, charge-tunable quantum rings" Physica E 9 (2001) 124
	Pierre M. Petroff, Axel Lorke, and Atac Imamoglu "Epitaxially Self-Assembled Quantum Dots" Physics Today (2001)
	B.G.L. Jager, S. Wimmer, A. Lorke, J.P. Kotthaus, W. Wegschneider, and M. Bichler "Edge and bulk effects in Terahertz photoconductivity of an antidot superlattice " Phys. Rev. B 63, 045315 (2001)
	I. Kegel, T.H. Metzger, A. Lorke, and J. Peisl "Determination of strain fields and composition of self-organized quantum dots using x-ray diffraction" Phys. Rev. B 63, 035318 (2001)
	A. Lorke, R.J. Luyken, J.M. Garcia, and P.M. Petroff "Growth and Electronic Properties of Self-Organized Quantum Rings" Jpn. J. Appl. Phys. 40, 1857 (2001)
	E. M. Höhberger, A. Lorke, W. Wegscheider, and M. Bichler "Adiabatic Pumping of Two-Dimensional Electrons in a Ratchet-Type Lateral Superlattice" Appl. Phys. Lett. 78 2905 (2001)