Muraki, K., Lok, J. G. S., Kraus, Stefan, Dietsche, W., Klitzing, Klaus von, Schuh, Dieter, Bichler, Max and Wegscheider, Werner
(2004)
Coulomb Drag as a Probe of the Nature of Compressible States in a Magnetic Field.
Physical Review Letters 92 (24), p. 246801.
Date of publication of this fulltext: 11 Jan 2010 13:10at publisher (via DOI)
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. ...
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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