Nonlinear absorption of surface acoustic waves by composite fermions
arXiv:cond-mat/0012351 · doi:10.1209/epl/i2001-00343-4
Abstract
Absorption of surface acoustic waves by a two-dimensional electron gas in a perpendicular magnetic field is considered. The structure of such system at the filling factor close to 1/2 can be understood as a gas of {\em composite fermions}. It is shown that the absorption at can be strongly nonlinear, while small deviation form 1/2 will restore the linear absorption. Study of nonlinear absorption allows one to determine the force acting upon the composite fermions from the acoustic wave at turning points of their trajectories.
7 pages, 1 figure, submitted to Europhysics letters