Uni Hamburg Fachbereich Physik
Logo STM/sts, SPM-Group, Institute of Applied Physics, Hamburg

Publications

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2017
 
A gateway towards non-collinear spin processing using three-atom magnets with strong substrate couplin
J. Hermenau, J. Ibañez-Azpiroz, Chr. Hübner, A. Sonntag, B. Baxevanis, K. T. Ton, M. Steinbrecher, A. A. Khajetoorians, M. dos Santos Dias, S. Blügel, R. Wiesendanger, S. Lounis, and J. Wiebe,
Nature Communications (2017)
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1997199819992000200120022003200420052006200720082009201020112012201320142015
2016
2017
 
Nickel: The time-reversal symmetry conserving partner of iron on a chalcogenide topological insulator
M. Vondráček, L. Cornils, J. Minár, J. Warmuth, M. Michiardi, C. Piamonteze, L. Barreto, J. A. Miwa, M. Bianchi, Ph. Hofmann, L. Zhou, A. Kamlapure, A. A. Khajetoorians, R. Wiesendanger, J.-L. Mi, B.-B. Iversen, S. Mankovsky, St. Borek, H. Ebert, M. Schüler, T. Wehling, J. Wiebe, and J. Honolka,
Phys. Rev. B 94 161114(R) (2016)
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Topological insulator homojunctions including magnetic layers: The example of n-type (n-QLs Bi2Se3/Mn-Bi2Se3) heterostructures
M. Vališka, J. Warmuth, M. Michiardi, M. Vondráček, A. S. Ngankeu, V. Holý, V. Sechovský, G. Springholz, M. Bianchi, J. Wiebe, P. Hofmann and J. Honolka,
Appl. Phys. Lett. 108 262402 (2016)
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Band-gap engineering by Bi intercalation of graphene on Ir(111)
J. Warmuth, A. Bruix, M. Michiardi, T. Hänke, M. Bianchi, J. Wiebe, R. Wiesendanger, B. Hammer, P. Hofmann, and A. A. Khajetoorians,
Phys. Rev. B 93 165437 (2016)
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Tailoring the chiral magnetic interaction between two individual atoms
A. A. Khajetoorians, M. Steinbrecher, M. Ternes, M. Bouhassoune, M. dos Santos Dias, S. Lounis, J. Wiebe, and R. Wiesendanger,
Nature Communications 7 10620 (2016)
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Absence of a spin-signature from a single Ho adatom as probed by spin-sensitive tunneling
M. Steinbrecher, A. Sonntag, M. dos Santos Dias, M. Bouhassoune, S. Lounis, J. Wiebe, R. Wiesendanger, and A. A. Khajetoorians,
Nature Communications 7 10454 (2016)
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Tunneling into thin superconducting films: Interface-induced quasiparticle lifetime reduction
P. Löptien, L. Zhou, , A. A. Khajetoorians, J. Wiebe, and R. Wiesendanger,
Surf. Sci. 643 6 (2016)
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2015
20162017
 
Tuning emergent magnetism in a Hund’s impurity
A. A. Khajetoorians, M. Valentyuk, M. Steinbrecher, T. Schlenk, A. Shick, J. Kolorenc, A. I. Lichtenstein, T. O. Wehling, R. Wiesendanger and J. Wiebe,
Nature Nanotechnology 10 958 (2015)
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Response of the topological surface state to surface disorder in TlBiSe2    
F. Pielmeier, G. Landolt, B. Slomski, S. Muff, J. Berwanger, A. Eich, A. A. Khajetoorians, J. Wiebe, Z. S. Aliev, M. B. Babanly, R. Wiesendanger, J. Osterwalder, E. V. Chulkov, F. J. Giessibl, and J. H. Dil,
New Journ. Phys. 17 023067 (2015)
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Intra- and interband electron scattering in a hybrid topological insulator: Bismuth bilayer on Bi2Se3    
A. Eich, M. Michiardi, G. Bihlmayer, X.-G. Zhu, J.-L. Mi, Bo B. Iversen, R. Wiesendanger, Ph. Hofmann, A. A. Khajetoorians, and J. Wiebe,
Phys. Rev. B 90 155414 (2014)
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Hitting the limit of magnetic anisotropy
Alexander Ako Khajetoorians and Jens Wiebe,
Science 344 976 (2014)
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Screening and atomic-scale engineering of the potential at a topological insulator surface
P. Löptien, L. Zhou, J. Wiebe, A. A. Khajetoorians, J. L. Mi, B. B. Iversen, Ph. Hofmann, and R. Wiesendanger,
Phys. Rev. B 89 085401 (2014)
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2013
2014201520162017
 
Spin Excitations of Individual Fe Atoms on Pt(111): Impact of the Site-Dependent Giant Substrate Polarization
A. A. Khajetoorians, T. Schlenk, B. Schweflinghaus, M. dos Santos Dias, M. Steinbrecher, M. Bouhassoune, S. Lounis, J. Wiebe, and R. Wiesendanger,
Phys. Rev. Lett. 111 157204 (2013)
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Controllable Magnetic Doping of the Surface State of a Topological Insulator
T. Schlenk, M. Bianchi, M. Koleini, A. Eich, O. Pietzsch, T. O. Wehling, T. Frauenheim, A. Balatsky, J.-L. Mi, B. B. Iversen, J. Wiebe, A. A. Khajetoorians, Ph. Hofmann, and R. Wiesendanger,
Phys. Rev. Lett. 110 126804 (2013)
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2012
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Robust Nodal Structure of Landau Level Wave Functions Revealed by Fourier Transform Scanning Tunneling Spectroscopy
K. Hashimoto, T. Champel, S. Florens, C. Sohrmann, J. Wiebe, Y. Hirayama, R. A. Römer, R. Wiesendanger, and M. Morgenstern,
Phys. Rev. Lett. 109 116805 (2012)
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Robust Surface Doping of Bi2Se3  by Rubidium Intercalation
M. Bianchi, R. C. Hatch, Z. Li, P. Hofmann, F. Song, J. Mi, B. B. Iversen, Z. M. Abd El-Fattah, P. Löptien, L. Zhou, A. A. Khajetoorians, J. Wiebe, R. Wiesendanger, and J. W. Wells,
ACS Nano 6 7009 (2012)
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In-plane magnetic anisotropy of Fe atoms on Bi2Se3(111)
J. Honolka, A. A. Khajetoorians, V. Sessi, T. O. Wehling, S. Stepanow, J.-L. Mi, B. B. Iversen, T. Schlenk, J. Wiebe, N. B. Brookes, A. I. Lichtenstein, Ph. Hofmann, K. Kern, and R. Wiesendanger,
Phys. Rev. Lett. 108 256811 (2012)
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Atom-by-atom engineering and magnetometry of tailored nanomagnets
A. A. Khajetoorians, J. Wiebe, B. Chilian, S. Lounis, S. Blügel, and R. Wiesendanger,
Nature Physics 8 497 (2012)
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Atom-specific spin mapping and buried topological states in a homologous series of topological insulators
S. V. Eremeev, G. Landolt, T. V. Menshchikova, B. Slomski, Y. M. Koroteev, Z. S. Aliev, M. B. Babanly, J. Henk, A. Ernst, L. Patthey, A. Eich, A. A. Khajetoorians, J. Hagemeister, O. Pietzsch, J. Wiebe, R. Wiesendanger, P. M. Echenique, S. S. Tsirkin, I. R. Amiraslanov, J. H. Dil, and E. V. Chulkov ,
Nat. Commun. 3 635 (2012)
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2011
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Real-space mapping of a disordered two-dimensional electron system in the quantum Hall regime
K. Hashimoto, J. Wiebe, T. Inaoka, Y. Hirayama, R. Wiesendanger, and M. Morgenstern,
Journal of Physics: Conference Series 334 012008 (2011)
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Anomalously large g factor of single atoms adsorbed on a metal substrate
B. Chilian, A. A. Khajetoorians, S. Lounis, A. T. Costa, D. L. Mills, J. Wiebe, and R. Wiesendanger,
Phys. Rev. B 84 212401 (2011)
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Logik aus atomaren Spins
J. Wiebe, A. A. Khajetoorians, B. Chilian, and R. Wiesendanger,
Physik in unserer Zeit 42 162 (2011)
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Experimental variation and theoretical analysis of the inelastic contribution to atomic spin excitation spectroscopy
B. Chilian, A. A. Khajetoorians, J. Wiebe, and R. Wiesendanger,
Phys. Rev. B 83 195431 (2011)
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Realizing All-Spin–Based Logic Operations Atom by Atom
A. A. Khajetoorians, J. Wiebe, B. Chilian, and R. Wiesendanger,
Science 332 1062 (2011)
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Spin-polarization of platinum (111) induced by the proximity to cobalt nanostripes
F. Meier, S. Lounis, J. Wiebe, L. Zhou, S. Heers, P. Mavropoulos, P. H. Dederichs, S. Blügel, and R. Wiesendanger,
Phys. Rev. B 83 075407 (2011)
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Itinerant Nature of Atom-Magnetization Excitation by Tunneling Electrons
A. A. Khajetoorians, S. Lounis, B. Chilian, A. T. Costa, L. Zhou, D. L. Mills, J. Wiebe, and R. Wiesendanger ,
Phys. Rev. Lett. 106 037205 (2011)
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1997199819992000200120022003200420052006200720082009
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Real-space mapping of a two-dimensional disordered system in the quantum Hall regime
K. Hashimoto, J. Wiebe, T. Inaoka, Y. Hirayama, R. Wiesendanger, and M. Morgenstern ,
J. Phys.: Conf. Series 334 012008 (2010)
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Detecting excitation and magnetization of individual dopants in a semiconductor
A. A. Khajetoorians, B. Chilian, J. Wiebe, S. Schuwalow, F. Lechermann, and R. Wiesendanger,
Nature 467 1084 (2010)
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Inversion of spin polarization above individual magnetic adatoms
L. Zhou, F. Meier, J. Wiebe, and R. Wiesendanger ,
Phys. Rev. B 82 012409 (2010)
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Strength and directionality of surface Ruderman–Kittel–Kasuya–Yosida interaction mapped on the atomic scale
L. Zhou, J. Wiebe, S. Lounis, E. Vedmedenko, F. Meier, S. Blügel, P. H. Dederichs, and R. Wiesendanger,
Nature Physics 6 187 (2010)
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199719981999200020012002200320042005200620072008
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Correction of systematic errors in scanning tunneling spectra on semiconductor surfaces: The energy gap of Si(111)-7x7 at 0.3 K
S. Modesti, H. Gutzmann, J. Wiebe, and R. Wiesendanger,
Phys. Rev. B 80 125326 (2009)
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Wavefunction Mapping of Immobilized InP Semiconductor Nanocrystals
G. Maruccio, Chr. Meyer, T. Matsui, D. V. Talapin, S. G. Hickey, H. Weller, and R. Wiesendanger,
Small 5 808 (2009)
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Quantum Hall Transition in Real Space: From Localized to Extended States
K. Hashimoto,C. Sohrmann, J. Wiebe, T. Inaoka, F. Meier, Y. Hirayama, R. A. Römer, R. Wiesendanger, and M. Morgenstern,
Phys. Rev. Lett. 101 256802 (2008)
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Anisotropic superexchange in one-dimensional Fe-chains on InAs(110)
L. Sacharow, R. Wiesendanger, G. Bihlmayer, S. Blügel and M. Morgenstern,
Surf. Sci. 602 3297 (2008)
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Revealing Magnetic Interactions from Single-Atom Magnetization Curves
F. Meier, L. Zhou, J. Wiebe, and R. Wiesendanger,
Science 320 82 (2008)
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Effect of charge manipulation on scanning tunneling spectra of single Mn acceptors in InAs
F. Marczinowski, J. Wiebe, F. Meier, K. Hashimoto, and R. Wiesendanger,
Phys. Rev. B 77 115318 (2008)
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Metal–Insulator Transition in Graphite: A Comparison to Heterostructures with High Carrier Mobility
E. V. Konenkova, D. Grundler, M. Morgenstern, and R. Wiesendanger,
Techn. Phys. Lett. 34 30 (2008)
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Local Electronic Structure near Mn Acceptors in InAs: Surface-Induced Symmetry Breaking and Coupling to Host States
F. Marczinowski, J. Wiebe, J.-M. Tang, M. E. Flatte, F. Meier, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. Lett. 99 157202 (2007)
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Correlation Effects in Wave Function Mapping of Molecular Beam Epitaxy Grown Quantum Dots
G. Maruccio, M. Janson, A. Schramm, C. Meyer, T. Matsui, C. Heyn, W. Hansen, R. Wiesendanger, M. Rontani, E. Molinari,
Nano Letters 7 2701 (2007)
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Imaging correlated wave functions of few-electron quantum dots: Theory and scanning tunneling spectroscopy experiments
M. Rontani, E. Molinari, G. Maruccio, M. Janson, A. Schramm, Chr. Meyer, T. Matsui, Chr. Heyn, W. Hansen, and R. Wiesendanger,
J. Appl. Phys. 101 081714 (2007)
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Electronic states of Fe atoms and chains on InAs(110) from scanning tunneling spectroscopy
T. Matsui, Chr. Meyer, L. Sacharow, J. Wiebe, and R. Wiesendanger,
Phys. Rev. B 75 165405 (2007)
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Co double-layer nanostructures on Pt(111) studied by spin-polarized scanning tunnelling microscopy
F. Meier, K. von Bergmann, J. Wiebe, M. Bode, and R. Wiesendanger,
J. Phys. D 40 1306 (2007)
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Spin-dependent electronic and magnetic properties of Co nanostructures on Pt(111) studied by spin-resolved scanning tunneling spectroscopy
F. Meier, K. von Bergmann, P. Ferriani, J. Wiebe, M. Bode, K. Hashimoto, S. Heinze, and R. Wiesendanger,
Phys. Rev. B 74 195411 (2006)
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Unoccupied surface state on Pt(111) revealed by scanning tunneling spectroscopy
J. Wiebe, F. Meier, K. Hashimoto, G. Bihlmayer, S. Blügel, P. Ferriani, S. Heinze, and R. Wiesendanger,
Phys. Rev. B 72 193406 (2005)
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Contributions of escape depth to photoelectron intensity of a well defined initial state
M. Morgenstern, T. Strasser, R. Adelung, M. Getzlaff, L. Kipp, W. Schattke, M. Skibowski, and R. Wiesendanger,
Phys. Rev. B 70 81305 (2004)
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Scanning tunneling spectroscopy on cobalt(0001): spectroscopic signature of stacking faults and dislocation lines.
J. Wiebe, L. Sacharow, A. Wachowiak, G. Bihlmayer, S. Heinze, S. Blügel, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. B 70 35404 (2004)
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A 300 mK ultra-high vacuum scanning tunneling microscope for spin-resolved spectroscopy at high energy resolution
J. Wiebe, A. Wachowiak, F. Meier, D. Haude, T. Foster, M. Morgenstern, and R. Wiesendanger,
Review of Scientific Instruments 75 4871 (2004)
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High spin polarization at the Fe/InAs(110) interface.
L. Sacharow, G. Bihlmayer, S. Blügel, and M. Morgenstern,
Phys. Rev. B 69 85317 (2004)
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Thickness dependent magnetization states of Fe islands on W(110): From single domain to vortex and diamond patterns.
M. Bode, A. Wachowiak, J. Wiebe, A. Kubetzka, M. Morgenstern, and R. Wiesendanger,
Appl. Phys. Lett. 84 948 (2004)
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Fundamental studies of magnetism down to the atomic scale: present status and future perspectives of spin-polarized scanning tunneling microscopy.
R. Wiesendanger, M. Bode, A. Kubetzka, O. Pietzsch, M. Morgenstern, A. Wachowiak, and J. Wiebe,
J. Magn. Magn. Mater. 272-276 2115 (2004)
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Visualizing the influence of interactions on the nanoscale: simple electron systems.
M. Morgenstern, J. Klijn, C. Meyer, D. Haude, and R. Wiesendanger,
Proc. STM´03 Conference, Eindhoven, NL (eds. P. M. Koenraad and M. Kemerink), AIP Conf. Proc. 696 11 (2003)
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STM measurements on the InAs(110) surface directly compared with surface electronic structure calculations.
J. Klijn, L. Sacharow, C. Meyer, S. Blügel, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. B 68 205327 (2003)
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Wave function mapping of InAs quantum dots by scanning tunneling spectroscopy.
Th. Maltezopoulos, A. Bolz, Chr. Meyer, Ch. Heyn, W. Hansen, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. Lett. 91 196804 (2003)
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Direct measurement of the local density of states of a disordered one-dimensional conductor.
C. Meyer, J. Klijn, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. Lett. 91 76803 (2003)
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Low density two-dimensional electron systems studied by scanning tunneling spectroscopy.
M. Morgenstern, J. Klijn, Chr. Meyer, M. Getzlaff, R. L. Johnson, R. Adelung, L. Kipp, R. A. Römer, and R. Wiesendanger,
Jpn. J. Appl. Phys. 42 4809 (2003)
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From quantized states to percolation: Scanning tunneling spectroscopy of a strongly disordered two-dimensional electron system.
J. Wiebe, Chr. Meyer, J. Klijn, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. B 68 41402 (2003)
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Direct observation of confined states in individual metallic single wall carbon nanotubes.
Th. Maltezopoulos, A. Kubetzka, M. Morgenstern, R. Wiesendanger, S. G. Lemay, and. C. Dekker,
Appl. Phys. Lett. 83 1011 (2003)
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Probing the Local Density of States of Dilute Electron Systems in Different Dimensions.
M. Morgenstern,
Surface Review and Letters 10 933-962 (2003)
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Real-space observation of drift states in a two-dimensional electron system at high magnetic fields.
M. Morgenstern, J. Klijn, Chr. Meyer, and R. Wiesendanger,
Phys. Rev. Lett. 90 56804 (2003)
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Comparing the local density of states of three- and two-dimensional electron systems by low-temperature scanning tunneling spectroscopy.
M. Morgenstern, D. Haude, J. Klijn, Chr. Meyer, L. Sacharow, S. Heinze, S. Blügel, and R. Wiesendanger,
Physica E 16 121 (2003)
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Comparing measured and calculated local density of states in a disordered two-dimensional electron system
M. Morgenstern, J. Klijn, Chr. Meyer, R. A. Römer, and R. Wiesendanger,
Physica B 329-333 1536 (2003)
 (not online available)
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Coulomb pseudogap caused by partial localization of a three dimensional electron system in the extreme quantum limit.
M. Morgenstern, D. Haude, J. Klijn, and R. Wiesendanger,
Phys. Rev. B 66 121102(R) (2002)
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Direct comparison of potential landscape and resulting local density of states of a disordered two-dimensional electron system.
M. Morgenstern, J. Klijn, Chr. Meyer, M. Getzlaff, R. Adelung, K. Roßnagel, L. Kipp, M. Skibowski, and R. Wiesendanger,
Phys. Rev. Lett. 89 136806 (2002)
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Co on p-InAs(110): An island induced two-dimensional electron system consisting of electron droplets.
M. Morgenstern, J. Wiebe, A. Wachowiak, M. Getzlaff, J. Klijn, L. Plucinks, R. L. Johnson, and R. Wiesendanger,
Phys. Rev. B 65 155325 (2002)
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The influence of potential fluctuations on Landau quantization and spin splitting studied by Low Temperature Scanning Tunneling Spectroscopy on InAs(110).
M. Morgenstern, V. Gudmundsson, Chr. Wittneven, R. Dombrowski, and R. Wiesendanger,
J. Vac. Sci. & Tech. A 20 2032 (2002)
 (not online available)
 
Direct Observation of Internal Spin-Structure of Magnetic Vortex Cores.
A. Wachowiak, J. Wiebe, M. Bode, O. Pietzsch, M. Morgenstern, and R. Wiesendanger,
Science 298 577 (2002)
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Experimental evidence for edge-like states in three-dimensional electron systems.
M. Morgenstern, D. Haude, Chr. Meyer, and R. Wiesendanger,
Phys. Rev. B 64 205104 (2001)
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Nonlocality of the exchange interaction probed by scanning tunneling spectroscopy.
M. Morgenstern, V.Gudmundsson, R.Dombrowski, Chr. Wittneven, and R. Wiesendanger,
Phys. Rev. B 63 201301 (2001)
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Nb-induced two-dimensional electron gas on n-InAs (100): Anomalous coverage dependence.
M. Getzlaff, M. Morgenstern, Chr. Meyer, R. Brochier, R.L. Johnson, and R. Wiesendanger,
Phys. Rev. B 63 205305 (2001)
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Local Density of States of a Three-Dimensional Conductor in the Extreme Quantum Limit.
D. Haude, M. Morgenstern, I. Meinel, and R. Wiesendanger,
Phys. Rev. Lett. 86 1582 (2001)
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Erratum: Origin of Landau Oscillations observed in Scanning Tunneling Spectroscopy on n-InAs(110)
M. Morgenstern, D. Haude, V. Gudmundson, Chr. Wittneven, R. Dombrowski, and R. Wiesendanger,
Phys. Rev. B 63 079901 (2001)
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Coverage dependence of the Fe-induced Fermi level shift and the two dimensional electron gas on InAs(110)
M. Morgenstern, M. Getzlaff, D. Haude, R.L. Johnson, and R. Wiesendanger,
Phys. Rev. B 61 13805 (2000)
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Origin of Landau oscillations observed in scanning tunneling spectroscopy on n-InAs(110).
M. Morgenstern, D. Haude, V. Gudmundsson, Chr. Wittneven, R. Dombrowski, and R. Wiesendanger,
Phys. Rev. B 62 7257 (2000)
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Spatial fluctuations of the density of states in magnetic fields observed with scanning tunneling spectroscopy.
M. Morgenstern, Chr. Wittneven, R. Dombrowski, and R. Wiesendanger,
Phys. Rev. Lett. 84 5588 (2000)
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Photoemission on two-dimensional electron systems.
M. Morgenstern, M. Getzlaff, J. Klijn, Ch. Meyer, A. Wachowiak, J. Wiebe, L. Plucinski, R.L. Johnson, R. Adelung, K. Roßnagel, and R. Wiesendanger,
HASYLAB annual report 2000 297 (2000)
 (not online available)
 
Low temperature scanning tunneling spectroscopy on InAs(110)
M. Morgenstern, D. Haude, V. Gudmundsson, Chr. Wittneven, R. Dombrowski, Chr. Steinebach, and R. Wiesendanger,
J. Electr. Spectr. Relat. Phenom. 109 127 (2000)
 (not online available)
19971998
1999
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Tip-induced band bending by scanning tunneling spectroscopy of the states of the tip-induced quantum dot on InAs(110)
R. Dombrowski, Chr. Steinebach, Chr. Wittneven, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. B 59 8043 (1999)
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Dispersion behavior of a two-dimensional electron gas
M. Getzlaff, M. Morgenstern, R.L. Johnson, and R. Wiesendanger,
HASYLAB annual report 1999 251 (1999)
 (not online available)
1997
1998
1999200020012002200320042005200620072008200920102011201220132014201520162017
 
Scattering States of Ionized Dopants probed by Low Temperature Scanning Tunneling Spectroscopy.
Ch. Wittneven, R. Dombrowski, M. Morgenstern, and R. Wiesendanger,
Phys. Rev. Lett. 81 5616 (1998)
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Local electronic properties in the presence of internal and external magnetic fields studied by variable-temperature scanning tunneling spectroscopy
R. Wiesendanger, M. Bode, R. Dombrowski, M. Getzlaff, M. Morgenstern, and C. Wittneven,
Jpn. J. Appl. Phys. 37 3769 (1998)
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Scanning Tunneling Spectroscopy on n-InAs(110): Landau Level Quantization and Scattering of Electron Waves at Dopant Atoms
R. Dombrowski, Ch. Wittneven, M. Morgenstern, and R. Wiesendanger,
Appl. Phys. A 66 203 (1998)
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Tieftemperatur-Rastertunnelspektroskopie an InAs(110): Streuung von Elektronenwellen an Dotieratomen und Spektroskopie an Landauniveaus
M. Morgenstern, R. Dombrowski, Ch. Wittneven, and R. Wiesendanger,
Phys. Bl. 54 423 (1998)
 (not online available)
 
Landau Level Quantization measured by Scanning Tunneling Spectroscopy on n-InAs(110)
M. Morgenstern, R. Dombrowski, Ch. Wittneven, and R. Wiesendanger,
Phys. Stat. Sol. 210 845 (1998)
 (not online available)

1997
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A low-temperature ultrahigh-vacuum STM/STS-system with rotatable magnetic field
Ch. Wittneven, R. Dombrowski, S.H. Pan, and R. Wiesendanger,
Rev. Sci. Instr. 68 3806 (1997)
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