Coulomb Drag as a Probe of the Nature of Compressible States in a Magnetic Field

K. Muraki, J. G. S. Lok, S. Kraus, W. Dietsche, K. von Klitzing, D. Schuh, M. Bichler, and W. Wegscheider
Phys. Rev. Lett. 92, 246801 – Published 15 June 2004

Abstract

Magnetodrag reveals the nature of compressible states and the underlying interplay of disorder and interactions. At ν=3/2 clear T4/3 dependence is observed, which signifies the metallic nature of the N=0 Landau level. In contrast, drag in higher Landau levels reveals an additional contribution, which anomalously grows with decreasing T before turning to zero following a thermal activation law. The anomalous drag is discussed in terms of electron-hole asymmetry arising from disorder and localization, and the crossover to normal drag at high fields as due to screening of disorder.

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  • Received 21 October 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.246801

©2004 American Physical Society

Authors & Affiliations

K. Muraki1,2, J. G. S. Lok1, S. Kraus1, W. Dietsche1, K. von Klitzing1, D. Schuh3, M. Bichler3, and W. Wegscheider3,*

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • 2NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
  • 3Walter-Schottky-Institut, Technische Universität München, 85748 Garching, Germany

  • *Present address: Fakultät für Physik, Universität Regensburg, D-93040 Regensburg, Germany.

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Vol. 92, Iss. 24 — 18 June 2004

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