Generation of tunable hypersonic phonons from two-dimensional electron gases under free-electron laser radiations
Department of Physics, University of Wollongong, Wollongong, NSW
Corresponding author: firstname.lastname@example.org
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