Abstract
The steady-state nonequilibrium phonon distribution function of a semiconductor in which the hot electronic gas is quantized by a strong magnetic field is calculated with the use of a quantum Boltzmann equation. There is a very strong cyclotron output in the direction perpendicular to the magnetic field. Conditions for which this output is strong as well as monochromatic and directional are found. A new tunable GaAs phonon source in the 100-GHz range should thus be possible.
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