Condensed Matter Seminar Series

Percolation Physics from Local Spectroscopies and Transport in Quantum Hall Systems: Theory and Experiment

Serge Florens

Institut Neel, Grenoble France

Thursday April 19,  11:00 am,  Room 298,  Physics Building

Abstract: Recent advances in high resolution scanning tunneling spectroscopy (STS) of disordered two-dimensional electron gases under high magnetic field have given direct evidence for long thought percolation ideas in quantum Hall physics. At the light of transport measurements and new theoretical developments [1,2], we show that classical percolation may prevail to fully  quantum behavior in a wide range of temperature relevant for experiments. The robust nodal structure of disordered Landau wavefunctions in high Landau levels will also be unveiled from the STS data [3].

[1] M. Floeser, S. Florens, T. Champel, Phys. Rev. Lett. 107, 176806 (2011).
[2] T. Champel, S. Florens and M. E. Raikh, Physical Review B 83, 125321 (2011).
[3] K. Hashimoto, T. Champel, S. Florens, C. Sohrmann, J. Wiebe, Y. Hirayama, R. A. Roemer, R. Wiesendanger and M. Morgenstern, arXiv:1201.2235.