Premium
Amplification of acoustic waves in magnetised piezoelectric semiconductors. Effect of nonlinearity in electron effective mass and collision frequency
Author(s) -
Dey Bose M.,
Ghosh S.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221520224
Subject(s) - physics , piezoelectricity , electron , acoustic wave , semiconductor , collision frequency , electric field , attenuation , magnetic field , acoustics , ion acoustic wave , nonlinear system , condensed matter physics , computational physics , optics , optoelectronics , quantum mechanics
An attempt is made to provide a theoretical approach to experimental studies of the acoustoelectric amplification in magnetised piezoelectric semiconductors showing that the attenuation of an acoustic wave crosses over to its amplification when the electron drift velocity exceeds the acoustic wave velocity. First a phenomenological theory is developed to study the relative change in electron effective mass and collision frequency when an acoustic wave passes through piezoelectric semiconductors. Then, analytically, it is shown that this nonlinearity due to the electric vector of the field associated with the wave can also explain this behaviour. Numerical computations are made for n‐InSb at 78 K. It is found that the magnetic field does not have any remarkable effect on amplification.