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