| Issue |
Europhys. Lett.
Volume 42, Number 2, April II 1998
|
|
|---|---|---|
| Page(s) | 191 - 196 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00229-y | |
| Published online | 01 September 2002 | |
Generation of tunable hypersonic phonons from two-dimensional electron gases under free-electron laser radiations
Department of Physics, University of Wollongong, Wollongong, NSW
2522, Australia
Corresponding author: wxu@wumpus.its.uow.edu.au
Received:
30
October
1997
Accepted:
10
March
1998
A theoretical study of generation of high-frequency acoustic-phonon emission by electrons in GaAs-based two-dimensional electron gases (2DEGs), subject to terahertz (THz) free-electron laser radiations, is presented. We have studied the frequency and angular distribution of the phonon emission generated optically via deformation potential coupling. The distinctive nature for electron-photon-phonon interactions in a 2DEG results in a strong dependence of the acoustic-phonon emission on strength E0 and frequency ω of the THz laser field. Consequently, the frequency and the angle for hypersonic phonon emission can be tuned by varying E0 and/or ω.
PACS: 72.20.Ht – High-field and nonlinear effects / 78.30.Fs – III-V and II-VI semiconductors / 78.66.Fd – III-V semiconductors
© EDP Sciences, 1998
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