Thursday seminar

[Cond.Matt. & Stat.Mech.Section]

SEMINAR on   Disorder and strong electron correlations



Thursday, 27 October -  11:30 a.m.

 

Luigi Stasi Seminar Room,  Leonardo Building - first floor

  

 

Serge FLORENS     ( CNRS, Grenoble )

 

"Local spectroscopies and percolating transport in quantum Hall systems: Theory and experiment"

  

Abstract

 

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.