Abstract
Phonon studies of two-dimensional electron systems are valuable, not only because they give directly information regarding the electron-phonon interaction, but also because they can give additional information regarding the physical nature of the electronic states. Over the past decade a number of phonon emission and absorption experiments have been carried out, for a review see [1], some of which have used the imaging technique. There is an intrinsic angular dependence of the phonon emission/absorption process which can be seen to arise partly from energy and momentum conservation considerations. The details of this angular dependence change upon the application of a strong magnetic field. In the quantum Hall regime phonon emission and absorption take place only at localised regions in the device. All of these effects can be studied in detail using phonon imaging. In this paper I will review some of the imaging experiments we have caried out at Nottingham.
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