title: Coulomb drag as a probe of the nature of compressible States in a magnetic field.
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.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Muraki
authors.forename: J G S
authors.initials: JG
authors.lastname: Lok
authors.forename: S
authors.initials: S
authors.lastname: Kraus
authors.forename: W
authors.initials: W
authors.lastname: Dietsche
authors.forename: K
authors.initials: K
authors.lastname: von Klitzing
authors.forename: D
authors.initials: D
authors.lastname: Schuh
authors.forename: M
authors.initials: M
authors.lastname: Bichler
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider