Seminar on Disorder and strong electron correlations: "Local spectroscopies and percolating transport in quantum Hall systems: Theory and experiment"
Starts 27 Oct 2011 12:30
Ends 27 Oct 2011 20:00
Central European Time
Leonardo da Vinci Building Luigi Stasi Seminar Room
Strada Costiera, 11
I - 34151 Trieste (Italy)
Recent advances in high resolution scanning tunneling spectroscopy of disordered two-dimensional electron systems under high magnetic field will be the starting point for theoretical developments aiming at a quantum description of guiding center motion of the usual cyclotron orbits. The emphasis will be put on real-space imaging of Landau states and the description of some new observables, such as two-point correlations of density of states in the quantum Hall regime.
In a second part of the talk, macroscopic transport will be studied theoretically in a high temperature range where the classical percolation of drift states dominates. Crossover functions are obtained, which allow the extraction of critical exponent from recent conductivity measurements.