IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Electronics Thursday Sessions
       Session EL-ThM

Paper EL-ThM5
Two Dimensional Electronic Properties of a Disordered Three Dimensional Conductor in the Extreme Quantum Limit

Thursday, November 1, 2001, 9:40 am, Room 124

Session: Quantum Electronics
Presenter: D. Haude, Hamburg University, Germany
Authors: D. Haude, Hamburg University, Germany
M. Morgenstern, Hamburg University, Germany
I. Meinel, Hamburg University, Germany
R. Wiesendanger, Hamburg University, Germany
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Scanning tunneling spectroscopy images of n-InAs(110)are recorded in magnetic fields corresponding to the extreme quantum limit. From the results it is concluded that the appearence of the so called Hall dip in magnetotransport corresponds to an appearance of a contrast pattern in the local density of states. The energy and magnetic field dependence of the contrast pattern is very similar to drift states usually expected in two dimensional systems exhibiting the quantum Hall effect. The appearance of a pseudogap at the Fermi level evidences that localization is involved in the change of the local density of states. From the results a simplified but straightforward explanation of the Hall dip controversially discussed since 1956 can be given.