One-dimensional model of many-exciton effects in photoluminescence spectra

We solve numerically in one dimension and in the self-consistent ladder approximation the many-body problem of interacting electrons and holes. The model contains the minimal ingredients allowing to take into account the coexistence of a population of bound excitonic states with weakly correlated e-h pairs. A simplified contact potential for the Coulomb interaction is used. The strong e-h correlation leads to asymmetric single particle spectral functions with structures related to bound excitonic states. This asymmetry becomes more pronounced at low temperature when the formation of a dense exciton gas occurs. We discuss the role of the many-exciton effects by comparing the photoluminescence peak energies obtained in the ladder and Hartree-Fock approximation.

Published in:
Physica Status Solidi A-Applied Research, 178, 435-440
Presented at:
6th International Conference on Optics of Excitons in Confined Systems (OECS-6), ASCONA, SWITZERLAND, AUG 30-SEP 02, 1999

 Record created 2009-09-22, last modified 2018-03-17

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