Nonlinear absorption of surface acoustic waves by composite fermions
Department of Physics, University of Oslo PO Box 1048 Blindern, N-0316 Oslo, Norway
2 Solid State Division, A. F. Ioffe Physico-Technical Institute 194021 St. Petersburg, Russia and Centre for Advanced Studies Drammensveien 78, 0271 Oslo, Norway
Corresponding author: email@example.com
Accepted: 26 March 2001
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 ν close to 1/2 can be understood as a gas of composite fermions. It is shown that the absorption at can be strongly nonlinear, while small deviation form 1/2 will restore the linear absorption. The 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.
PACS: 73.50.Rb – Acoustoelectric and magnetoacoustic effects / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.)
© EDP Sciences, 2001