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Generation of tunable hypersonic phonons from two-dimensional electron gases under free-electron laser radiations

Journal Article


Abstract


  • 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.

Publication Date


  • 1998

Citation


  • Xu, W., & Zhang, C. (1998). Generation of tunable hypersonic phonons from two-dimensional electron gases under free-electron laser radiations. Europhysics Letters, 42(2), 191-196. doi:10.1209/epl/i1998-00229-y

Scopus Eid


  • 2-s2.0-0032521949

Start Page


  • 191

End Page


  • 196

Volume


  • 42

Issue


  • 2

Abstract


  • 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.

Publication Date


  • 1998

Citation


  • Xu, W., & Zhang, C. (1998). Generation of tunable hypersonic phonons from two-dimensional electron gases under free-electron laser radiations. Europhysics Letters, 42(2), 191-196. doi:10.1209/epl/i1998-00229-y

Scopus Eid


  • 2-s2.0-0032521949

Start Page


  • 191

End Page


  • 196

Volume


  • 42

Issue


  • 2