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

DOI to cite this document:: 10.5283/epub.11807

Muraki, K. ; Lok, J. G. S. ; Kraus, Stefan ; Dietsche, W. ; Klitzing, Klaus von ; Schuh, Dieter ; Bichler, Max ; Wegscheider, Werner

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Date of publication of this fulltext: 11 Jan 2010 13:10

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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. ...