| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 661 - 667 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00343-4 | |
| Published online | 01 December 2003 | |
Nonlinear absorption of surface acoustic waves by composite fermions
1
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: joakim.bergli@fys.uio.no
Received:
29
November
2000
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
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