Dynamics of Non-equilibrium Short-wave-length
Phonons in Semiconductor Heterostructures
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The behavior of short-wave-length acoustic phonons in the vicinity of a quantum well in a GaAs/AlGaAs heterostructure has been investigated. Hot two-dimensional electrons in the well produce longitudinal optical phonons, which decay into almost monoenergetic short-wave-length longitudinal acoustic (LA) phonons. The latter undergo elastic scattering and down-conversion into transverse acoustic (TA) phonons. The distribution of the LA and TA phonons over frequency and distance to the well have been found by solving semi-analytically a system of two kinetic equations with nontrivial boundary conditions and nonlinear dispersion. The distribution functions have essentially non-temperature form even at substantial distance from the well.
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1938 ◽
Vol 167
(930)
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pp. 384-391
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2017 ◽
Vol 59
(8-9)
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pp. 763-771
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1963 ◽
Vol 18
(7)
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pp. 557-562
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1960 ◽
Vol 6
(1)
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pp. 31-34