Abstract
Magnetodrag reveals the nature of compressible states and the underlying interplay of disorder and interactions. At clear dependence is observed, which signifies the metallic nature of the Landau level. In contrast, drag in higher Landau levels reveals an additional contribution, which anomalously grows with decreasing 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.
- Received 21 October 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.246801
©2004 American Physical Society