The Change of Sound Velocity at the Bose‐Einstein Condensation of Excitons in Crystals | Zendy

Miglei M. F. | Zendy; Moskalenko S. A. | Zendy; Lelyakov A. V. | Zendy

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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.

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