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Investigation of Nonequilibrium Phonons in GaAs
Author(s) -
Danilchenko B. A.,
Poroshin V. N.,
Slutskii M. I.,
Asche M.
Publication year - 1986
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.2221360107
Subject(s) - phonon , non equilibrium thermodynamics , condensed matter physics , polarization (electrochemistry) , spectral line , physics , radiation , materials science , atomic physics , optics , chemistry , quantum mechanics
The propagation of acoustic phonons in GaAs generated by laser radiation of a clean as well as Au coated surface are experimentally investigated in dependence on the crystallographic orientation. The angular dependence of the T 1 phonon spectrum is confirmed by comparison with the calculated focussing factor. Besides the ballistic motion of modes of L, T 1 , and T 2 polarization a further peak is observed in the time of flight spectra, which is interpreted by repeated conversion and decay processes of high‐frequency phonons leading to T 2 modes with a frequency low enough for ballistic motion.