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Microscopic theory of the dephasing of coherent optical phonons due to anharmonic decay in polar semiconductors
Author(s) -
Wenschuh U.,
Schäfer W.,
Zimmermann R.
Publication year - 1995
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.2221880140
Subject(s) - dephasing , anharmonicity , phonon , physics , condensed matter physics , raman spectroscopy , renormalization , semiconductor , chemistry , quantum mechanics
The dephasing of coherent longitudinal optical phonons due to anharmonic decay is investigated from a microscopic point of view. Time‐resolved coherent anti‐Stokes Raman signals are calculated for GaP on the basis of a full phonon dispersion calculation and the relevant decay channels are identified and compared. Anharmonic renormalization effects in the phonon spectrum and their influence on the dephasing signals are investigated. Non‐Markovian dynamics of dephasing are calculated for GaP and result in a 30% faster dephasing signal than the corresponding Markovian dynamics.