Semiconductor Physics, Quantum Electronics & Optoelectronics. 2000. V. 3, N 4. P. 427-431.

Piezoelectrically active acoustic waves confined
in a quantum well and their amplification
by electron drift

Institute of Semiconductor Physics, NAS Ukraine, 45 Prospect Nauki, Kyiv, 03028, Ukraine
E-mail: kochelap@nika1.pp.kiev.ua

Abstract. In [1] we have studied how the drift of two-dimensional electrons amplifies the acoustic waves confined in quantum wells. The electron-phonon interaction was considered to be due to deformation potential. Here we generalize the theory for the case of piezoelectric electron-phonon interaction. For transverse piezoelectrically active waves in sphalerite-type crystals we obtained solution in the form of localized waves and determined the amplification factor a under the drift of two-dimensional electrons. At frequencies of the order of tens GHz and drift fields of several V/cm a is about tens of cm^-1.

Keywords: acoustic waves, two-dimensional electrons, quantum well, piezoelectric electron-phonon interaction.

Paper received 30.07.99; revised manuscript received 13.11.00; accepted for publication 12.12.00.

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