The Effect of a Magnetic Field on the Phonon Emission from a Hot 2-DEG in the Inversion Layer of a Silicon MOSFET

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Abstract
Phonon emission by a heated two dimensional electron gas in a magnetic field has been studied using heat pulse techniques. The 2-DEG was heated by applying electrical pulses to the MOSFET source-drain electrodes at constant gate voltage and the heat pulses detected by cadmium sulphide bolometers. Using constant power input to the 2-DEG the detected signal was found to decrease by up to 20% in a field of 7T. In a magnetic field phonons are emitted at the cyclotron frequency. At high fields the cyclotron phonons are severely attenuated by isotope scattering in the Si substrate.

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