Condensed Matter Seminar Series
Percolation Physics from Local Spectroscopies and Transport in Quantum Hall Systems: Theory and Experiment
Institut Neel, Grenoble France
Thursday April 19, 11:00 am, Room 298, Physics Building
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 .
 M. Floeser, S. Florens, T. Champel, Phys. Rev. Lett. 107, 176806 (2011).
 T. Champel, S. Florens and M. E. Raikh, Physical Review B 83, 125321 (2011).
 K. Hashimoto, T. Champel, S. Florens, C. Sohrmann, J. Wiebe, Y.
Hirayama, R. A. Roemer, R. Wiesendanger and M. Morgenstern,
Host: Harold Baranger