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Physica A Statistical Mechanics and its Applications

On the theory of dense exciton systems

Christo I. Ivanov, H. Barentzen, Marvin D. Girardeau

Published Jan 1, 1987• 5 citations
Publisher
DOI
10.1016/0378-4371(87)90084-7

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physica status solidi (b)•Oct 1, 1985•10 citations
Abstract The nonlinear response of a dense exciton gas in a platelet on an externally driven field is discussed using non equilibrium Green's function technique. A generalized Boltzmann‐equation of excitons containing many‐particle corrections in the diffusion‐, drift‐ and collision‐term is derived. Using a relaxed distribution (Boltzmann‐distribution) and an unrelaxed distribution (macro‐occupation) of ls‐excitons a bistability in exciton density as well as in the transmitted light intensity is obtained for a nearly resonant and stationary applied pump‐field of intensity 0.1 and 10kW/cm2, respectively. The bistability is obtained as a pure excitonic effect below the Mott‐transition.