Magnetization and Energy Gaps of a High-Mobility 2D Electron Gas in the Quantum Limit

S. A. J. Wiegers, M. Specht, L. P. Lévy, M. Y. Simmons, D. A. Ritchie, A. Cavanna, B. Etienne, G. Martinez, and P. Wyder
Phys. Rev. Lett. 79, 3238 – Published 27 October 1997
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Abstract

We have measured the magnetization of several single-layer, high-mobility 2D electron gas AlGaAs-GaAs heterostructures in the quantum limit. Abrupt jumps in the magnetization are observed when an integer number of Landau levels is filled. The width and the magnitude of the jumps identify incompressibility gaps in the energy spectrum of the order of the cyclotron energy, in which a small fraction of the total number of states is present. Sizable magnetization steps associated with the spin splitting are observed at odd filling factors (including ν=1) and give a measure of the exchange enhancement of the spin splitting.

  • Received 19 February 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.3238

©1997 American Physical Society

Authors & Affiliations

S. A. J. Wiegers1, M. Specht1, L. P. Lévy1,2, M. Y. Simmons3, D. A. Ritchie3, A. Cavanna4, B. Etienne4, G. Martinez4, and P. Wyder4

  • 1Grenoble High Magnetic Field Laboratory, Max-Planck Institut für Festkörperforschung-Centre National de la Recherche Scientifique, B.P. 166, F-38042 Grenoble Cedex 9, France
  • 2Institut Universitaire de France and Université Joseph Fourier, Grenoble, France
  • 3Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom
  • 4Laboratoire de Microstructures et de Microfabrication, B.P. 107, F-92225 Bagneux Cedex, France

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Vol. 79, Iss. 17 — 27 October 1997

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