Abstract
A peculiar feature of the phonon emission by a warm two-dimensional electron gas (2DEG) in a gallium-arsenide (GaAs) heterojunction is that, compared with the transverse acoustic (TA) mode, emission of the longitudinal acoustic (LA) mode is very weak. In bulk GaAs, LA emission is much stronger because the LA mode couples to electrons in GaAs via the deformation potential (DP) whereas the TA does not. One possible reason for the anomaly is that in a 2DEG, owing to the reduction in phase space for electron scattering, the electron–phonon interaction is cut off at small wavevector, q, before DP coupling (∝q) can dominate over piezoelectric (PE) coupling (∝q—1).
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