Abstract
The phonon emission from a hot two dimensional electron gas at a gallium arsenide/aluminium gallium arsenide interface has been studied using heat pulse techniques. Measurements as a function of power, propagation direction and applied magnetic field have been made. The absence of any observable longitudinal acoustic mode emission together with a dramatic broadening of the transverse acoustic mode angular distribution pattern leads us to conclude that the observed phonon signal is that of the decay products of optical phonon emission. We are able to estimate the electron temperature during a typical pulse and give a value for the optical phonon emission rate at that temperature. At the highest powers oscillations in the rate of phonon emission as a function of magnetic field are observed which we attribute to magneto-phonon resonance.
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