Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.45: Poster

Donnerstag, 17. März 2011, 18:00–21:00, P4

Thermally activated Transport in Quantum Hall Systems — •Martina Flöser¹, Serge Florens¹, and Thierry Champel² — ¹Institut Néel, CNRS-Université Joseph Fourier, Grenoble — ²LPMMC, CNRS-Université Joseph Fourier, Grenoble

We study the thermally activated charge transport in the regime of the quantum Hall effect, where temperature is smaller than the Landau level spacing, but large compared to the onset of quantum tunneling. We show, using diagrammatic methods within a local conductivity model, that smooth disorder leads to slow fluctuations in the Hall components, and provides a small dissipative conductance. Our results demonstrate a microscopic connection between the macroscopic longitudinal and transverse resistance and the disorder distribution, which can be tested experimentally by simultaneous transport and local spectroscopy measurements.