On the theory of amplification of meso-ultrasound in anisotropic monopolar semiconductors |
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Authors: | A A Lipnik |
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Institution: | (1) Kiev Commercial-Economic Institute, USSR |
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Abstract: | The electronic absorption coefficient ( e) of meso-ultrasound ( p –1 en, t, ee; ql 1, where p, en, t are the times of pulse relaxation, energy, and current carrier traps;
ee
–1
is the frequency of intraelectron collisions; , q are the frequency and wave vector of sound; l is the carrier mean free path) in the presence of a permanent external field E0 e
0
–1
q 0T is calculated for anisotropic single-valley semiconductors with piezoelectrical and potential-deformation acoustoelectronic interaction. Considered arbitrary are: 1) the anisotropy of the tensors
* and
p (and other crystal parameters); 2) the degree of Fermi degeneration of the carriers; 3) the dependence of
p on the carrier energy . The acoustoheat nonlinearity is neglected. The possibility of meso-ultrasound amplification by the transverse field (E0 - q) is predicted. By changing the orientation of the vector q relative to the crystal axes, the transverse threshold field (E
thr
) can be controlled smoothly and within broad limits, This permits the production of a mechanical sound-amplification regulator or a modulator of its intensity. The ratio between E
thr
and E
thr
yields a measure of the relative anisotropy of the mobility.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 87–92, February, 1977. |
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Keywords: | |
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