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Many‐Body Theory for the Dense Exciton Gas of Direct Semiconductors. III. Response of the Many‐Exciton System on an Externally Driven Light Field
Author(s) -
May V.,
Boldt F.,
Henneberger K.
Publication year - 1985
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.2221310222
Subject(s) - exciton , bistability , physics , distribution function , optical bistability , condensed matter physics , boltzmann equation , field (mathematics) , semiconductor , biexciton , diffusion , boltzmann constant , nonlinear system , quantum mechanics , nonlinear optics , mathematics , pure mathematics
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/cm 2 , respectively. The bistability is obtained as a pure excitonic effect below the Mott‐transition.