Nonlinear Absorption of Surface Acoustic Waves by Composite Fermions
OSLO UNIV (NORWAY) DEPT OF PHYSICS
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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 nu close to 12 can be understood as a gas of composite fermions. It is shown that the absorption at nu 12 can be strongly nonlinear while small deviation from 12 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.
- Line, Surface and Bulk Acoustic Wave Devices