Coulomb drag as a probe of the nature of compressible States in a magnetic field |
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Authors: | Muraki K Lok J G S Kraus S Dietsche W von Klitzing K Schuh D Bichler M Wegscheider W |
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Affiliation: | Max-Planck-Institut für Festk?rperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany. |
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Abstract: | Magnetodrag reveals the nature of compressible states and the underlying interplay of disorder and interactions. At nu=3/2 clear T(4/3) 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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