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Nonequilibrium Effects on Condensation of Excitons
Author(s) -
Nazarenko A.V.,
Ogawa T.,
Sugakov V.I.
Publication year - 2001
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 - 10.1002/1521-3951(200112)228:3<857::aid-pssb857>3.0.co;2-p
Subject(s) - exciton , annihilation , physics , condensation , biexciton , oscillation (cell signaling) , condensed matter physics , collision , kinetic energy , non equilibrium thermodynamics , quantum mechanics , chemistry , thermodynamics , biochemistry , computer security , computer science
Statistical theory of exciton condensation processes is presented to clarify effects of a finite lifetime and two‐body collisions of unstable particles on their phase separation. Several mechanisms of exciton disappearance, including an electron–hole pair annihilation due to the exciton–exciton collision, are taken into full account. It is shown that in the case of stationary pumping the phase stratification takes place if the exciton lifetime is longer than a critical time and the collision‐annihilation rate is smaller than a critical value. The dynamical structure factor is calculated in a stationary regime. The exciton–exciton collision‐annihilation process leads to an asymmetric form of the phase diagram. Due to the exciton finite lifetime the density‐correlation function becomes an oscillating function of the space coordinates; the period of the oscillation depends on kinetic parameters.