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

Muraki, K., Lok, J. G. S., Kraus, Stefan, Dietsche, W., Klitzing, Klaus von, Schuh, Dieter, Bichler, Max und Wegscheider, Werner (2004) Coulomb Drag as a Probe of the Nature of Compressible States in a Magnetic Field. Physical Review Letters 92 (24), S. 246801.

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Zusammenfassung

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. ...

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