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Luminescence of a “Cold” gas of biexcitons in CuCl
Author(s) -
Levy R.,
Klingshirn C.,
Ostertag E.,
Phach Vu Duy,
Grun J. B.
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.2220770140
Subject(s) - biexciton , exciton , radiative transfer , atomic physics , luminescence , photoluminescence , phonon , condensation , physics , materials science , condensed matter physics , quantum mechanics , optoelectronics , thermodynamics
The emission due to the radiative decay of biexcitons in CuCl is studied at low temperatures. Biexcitons formed of free excitons mainly under LO phonon emission, contribute to the broad emission bands observed. In the case of direct creation of biexcitons by resonant two‐photon absorption, a “cold” biexciton gas is created which is not in thermal equilibrium and gives rise to the narrow emission lines. A Bose‐Einstein condensation of the biexcitons seems to be very unlikely.