Condensed Matter Seminar - Dr. Maxim Khodas, Brookhaven National Laboratory

Abstract:  We study transport properties of a two-dimensional electron
gas, placed in a classically strong perpendicular magnetic field and in
constant and oscillating in-plane electric fields. The analysis is based
on a quantum Boltzmann equation derived for a weakly disordered
two-dimensional electron as. We consider disordered potential with mixed
long and short range correlations, Electron scattering off such disorder
is not limited to small change in momentum direction, but occurs on an
arbitrary angle, including the backscattering. The non-linearity of the
transport in the considered system is a consequence of two co-existing
effects: formation of a non-equilibrium distribution function of electrons
and modification of the scattering rate o the disorder in the presence of
dc and ac electric fields. This work describes both effects in a unified
way. The calculated dissipative component of electric current oscillates
as a function of the electric field strength and frequency of microwave
radiation in a qualitative agreement with experiments.