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The Coherent Pairing and Bose‐Einstein Condensation of Excitons in Semiconductors
Author(s) -
Bobrysheva A. I.,
Moskalenko S. A.,
Shvera Yu. M.
Publication year - 1988
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.2221470230
Subject(s) - exciton , biexciton , bose–einstein condensate , condensed matter physics , physics , spins , spin (aerodynamics) , electron , pairing , condensation , quantum mechanics , superconductivity , thermodynamics
The possibility of particle and pair Bose‐Einstein condensation in a system of four species of excitons with different values of spin projections of the electron and of the hole is studied. It is known that the system has the following properties: 1) the interaction of the exciton of either type with all the exciton species is repulsive on the average; 2) the pairs of excitons with antiparallel spins of electrons as well as of holes interact attractively and biexcitons can be formed. In two limiting cases when the exciton–exciton interaction energy W is greater or smaller than the ortho–para‐exciton splitting Δ, it is shown that: 1. the coherent pairing of excitons with momenta k and − k coincides with Bose‐Einstein condensation of biexcitons with zero translational momentum. Such a state persists without collapse due to the internal spin structure of excitons. 2. In the system of para‐ and ortho‐excitons the Bose‐Einstein condensation of para‐excitons and biexcitons formed by two ortho‐excitons with zero total spin can take place simultaneously.