Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 44: Poster II
HL 44.61: Poster
Donnerstag, 11. März 2004, 16:30–19:00, Poster A
Computation of the local density of states for a 2D disordered electron system — •Jorge Stephany1,2, Rudolf Römer1, and Markus Morgenstern3 — 1Department of Physics and Centre for Scientific Computing, University of Warwick,Coventry CV4 7AL, UK — 2Departamento de Física, Universidad Simón Bolívar, Apartado 89000, Caracas 1080A,Venezuela. — 3Institute of Applied Physics, Hamburg University, Jungiusstrasse 11, D-20355 Hamburg, Germany
The potential landscape for a 2D disordered electron system obtained by depositing Fe atoms on the InAs(110) surface has been determined experimentally [1]. We use this potential as the input to compute the local density of states of this system by a direct diagonalization of the associated Anderson localization hamiltonian using a modified Lanczos algorithm. The result is then compared with the experimental local density of states obtained by scanning tunneling spectroscopy. We next perform the correspondig computation for the case in which an external magnetic field is applied where Landau quantization has been recently observed[2].
[1] M.Morgenstern et al, Phys. Rev. Lett., 89, (2002) 136806
[2] M.Morgenstern et al, Phys. Rev. Lett., 90, (2003) 056804