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Bose‐Einstein condensation of free excitons in AgBr‐type crystals at high excitation
Author(s) -
Lelyakov A. V.
Publication year - 1976
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.2220770104
Subject(s) - exciton , brillouin zone , luminescence , condensed matter physics , excitation , bose–einstein condensate , radius , physics , degenerate energy levels , phonon , atomic physics , materials science , optics , quantum mechanics , computer security , computer science
The shape of the excitonic luminescence band is studied for degenerate excitons of great radius at T ≠ 0 K in crystals with indirect bandgap. A calculation is made of the transition probability from a macroscopically occupied exciton state with wave vector k correeponding to the boundary of the Brillouin zone, under photon and phonon emission. The luminescence band consists of a δ‐type peak and a broader, and less intense, short‐wavelength satellite. The theory is compared with experiments for AgBr crystals.