Single-impurity tunneling spectroscopy to probe the discrete states of a two-dimensional electron gas in a quantizing magnetic field

B. Jouault, M. Gryglas, G. Faini, U. Gennser, A. Cavanna, M. Baj, and D. K. Maude
Phys. Rev. B 73, 155415 – Published 13 April 2006

Abstract

A single impurity is used to probe the local density of states of a two-dimensional electron gas (2DEG) in a resonant tunneling experiment. The studies have been performed in the GaAsAlAsGaAs system, with Si donors incorporated into the AlAs layer, on submicrometer junctions. The current-voltage characteristics clearly show peaks corresponding to the formation of Landau levels. Moreover, additional fine-structure superimposed on the Landau levels are resolved. Detailed magnetic field studies suggest that those peaks reflect the single particle states of the Landau levels. The surprisingly rapid shift of these additional features in a magnetic field is reproduced in a model, which takes into account disorder in the plane of the 2DEG.

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  • Received 24 November 2005

DOI:https://doi.org/10.1103/PhysRevB.73.155415

©2006 American Physical Society

Authors & Affiliations

B. Jouault

  • Groupe d’Étude des Semiconducteurs, Université Montpellier II, Place E. Bataillon, 34095 Montpellier, France

M. Gryglas, G. Faini, U. Gennser, and A. Cavanna

  • Laboratoire de Photonique et Nanostructures, Centre National de la Recherche Scientifique, Route de Nozay, 91460 Marcoussis, France

M. Baj

  • Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland

D. K. Maude

  • Grenoble High Magnetic Field Laboratory, Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, 38042 Grenoble, France

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Issue

Vol. 73, Iss. 15 — 15 April 2006

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