Nonlinear absorption of surface acoustic waves by composite fermions

Details Nonlinear absorption of surface acoustic waves by composite fermions Nonlinear absorption of surface acoustic waves by composite fermions

2000-12-19

arxiv.org/abs/cond-mat/0012351v1

Europhys. Lett., 54, 661 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 1 figure, submitted to Europhysics letters

Scientific paper

10.1209/epl/i2001-00343-4

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 1/2 can be understood as a gas of {\em composite fermions}. It is shown that the absorption at $\nu =1/2 $ 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.

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