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The Change of Sound Velocity at the Bose‐Einstein Condensation of Excitons in Crystals
Author(s) -
Miglei M. F.,
Moskalenko S. A.,
Lelyakov A. V.
Publication year - 1969
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.19690350140
Subject(s) - exciton , phonon , physics , bose–einstein condensate , condensed matter physics , perturbation theory (quantum mechanics) , perturbation (astronomy) , quantum mechanics
Belyaev's equations are generalized for the case of a non‐ideal gas of excitons interacting with the phonons in the crystal at T = 0. In the first approximation of the perturbation theory the energetic spectrum of the elementary excitations is received. The change of sound velocity in some crystals is calculated for different assumptions with reference to the constants of exciton‐exciton and exciton‐phonon interactions.