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Observation of the local structure of Landau bands in a disordered conductor

Research output: Contribution to journalJournal article

Published

Journal publication date24/02/1997
JournalPhysical Review Letters
Journal number8
Volume78
Number of pages4
Pages1540-1543
Original languageEnglish

Abstract

The local density of states of heavily doped GaAs is explored at high magnetic fields, where only a single or few Landau bands are occupied. Our experiment is based on resonant tunneling through impurity states and images the local density of states both below and above the Fermi level. Fan-type mesoscopic fluctuations are observed in the energy-magnetic-field plane, which we attribute to the interplay of Landau quantization and quantum interference of scattered electron waves in the disordered conductor. Our conclusion is supported by the suppression of the fluctuations high above the Fermi level, where dephasing due to inelastic processes is as fast as elastic scattering.

Bibliographic note

© 1997 The American Physical Society