DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2004 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

HL: Halbleiterphysik

HL 14: Symposium Quanten-Hall-Systeme

HL 14.4: Talk

Tuesday, March 9, 2004, 11:45–12:15, H15

Coulomb Drag as a Probe of the Nature of Compressible States in a Magnetic Field — •Sjoerd Lok1, K. Muraki1, S. Kraus1, W. Dietsche1, K. Von Klitzing1, D. Schuh2, M. Bichler2, and W. Wegscheider21Max Planck Insitut für Festkörperforschung, Heisenbergstrasse 1 70569 Stuttgart — 2Walter Schottky Insitut, Technische Universität München, Am Coulomb Wall, 85748 Garching

Magneto-drag reveals the nature of compressible states and the underlying interplay of disorder and interactions. At filling factor 3/2 a 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. 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.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg