Spectroscopy of local density of states fluctuations in a disordered conductor

Schmidt, T. and Haug, R. J. and Falko, Vladimir and von Klitzing, K. and Förster, A. and Lüth, H. (1996) Spectroscopy of local density of states fluctuations in a disordered conductor. EPL, 36 (1). pp. 61-66. ISSN 0295-5075

Abstract

The local density of states of a degenerate semiconductor is investigated at low magnetic fields by resonant tunneling through a discrete localized energy level. Mesoscopic fluctuations of the local density of states below the Fermi level are imaged as temperature-insensitive fine structure in the tunneling current. These fluctuations are attributed to quantum interference of diffusive electron waves in the three-dimensional disordered system.