Enhancement of terahertz acoustic-phonon generation by the magnetic field applied parallel to a two-dimensional semiconductor system
- 5 February 1996
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 68 (6) , 823-825
- https://doi.org/10.1063/1.116545
Abstract
In this letter, we present a theoretical study on terahertz (THz) acoustic-phonon emission in AlxGa1−xAs parabolic quantum-well structures in parallel magnetic fields. Our theoretical results show that (i) the generation of acoustic-phonon signals can be enhanced significantly by the in-plane magnetic fields; (ii) the strongest acoustic-phonon emission can be observed around a magnetic field where an electronic subband becomes depopulated; (iii) the generated acoustic-phonon frequency depends weakly on the magnetic fields; and (iv) the presence of an in-plane magnetic field slightly varies the acoustic-phonon emission angle from that at zero magnetic field.Keywords
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