IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Semiconductors Tuesday Sessions
       Session SC-TuM

Paper SC-TuM4
Scanning Tunneling Spectroscopy on Adsorbate Induced Two Dimensional Electron Systems on InAs(110)

Tuesday, October 30, 2001, 9:20 am, Room 124

Session: Semiconductor Interfaces and Thin Films
Presenter: J. Klijn, Hamburg University, Germany
Authors: J. Klijn, Hamburg University, Germany
M. Morgenstern, Hamburg University, Germany
Chr. Meyer, Hamburg University, Germany
D. Haude, Hamburg University, Germany
R. Wiesendanger, Hamburg University, Germany
Correspondent: Click to Email
Two dimensional electron systems (2DES) are usually prepared in heterostructures and thus buried below the surface. Scanning probe methods are consequently restricted to resolutions above 100 nm.@footnote 1@ To increase the spatial resolution, we have prepared an adsorbate induced 2DES close to the surface on n-type InAs(110).@footnote 2@ We measured the local density of states of this 2DES in zero and in finite magnetic field (T=6K, B<=6T). The data at zero field reflect the scattered wave functions at the residual dopants. The corresponding Fourier transformation identifies the k-vector of the undisturbed 2DES as the strongest contribution. However, mixing with other k-vectors due to the potential scattering leads to broadening of the k-space features. The magnetic field data show Landau quantization of the 2DES and exhibit distinct changes in the local density of states. @FootnoteText@ @footnote 1@ S.H. Tessmer et al., Nature 392(1998)51; N.B. Zhitenev et al., Nature 404(2000)473; P. Weitz et al., appl.Surf.Sci. 157(2000)349 @footnote 2@ M. Morgenstern et al., Phys. Rev.B 61(2000)13805.