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Exciton Transport in Cu 2 O: Phonon Wind versus Superfluidity
Author(s) -
Tikhodeev S. G.,
Kopelevich G. A.,
Gippius N. A.
Publication year - 1998
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/(sici)1521-3951(199803)206:1<45::aid-pssb45>3.0.co;2-5
Subject(s) - exciton , superfluidity , phonon , bose–einstein condensate , condensed matter physics , excitation , physics , condensation , pulse (music) , quantum mechanics , voltage , thermodynamics
We focus on the recent experimental work by Mysyrowicz et al., in which nondiffusive transport of excitons in Cu 2 O was reported and attributed to Bose Einstein condensation of excitons. We discuss an alternate explanation of the macroscopic transport of excitons in Cu 2 O, its nonlinearity in case of two‐pulse excitation, and the recently reported “exciton laser” effect under pulse and cw excitation. We show that these effects can be more reasonably attributed to the nonequilibrium phonon induced drag (“phonon wind”) and cannot be considered as experimental evidence of Bose Einstein condensation and superfluidity of excitons in Cu 2 O.