Traces of stimulated bosonic exciton-scattering in semiconductor luminescence

Details Traces of stimulated bosonic exciton-scattering in semiconductor luminescence Traces of stimulated bosonic exciton-scattering in semiconductor luminescence

2004-04-30

arxiv.org/abs/cond-mat/0404739v1

Physics

Condensed Matter

Other Condensed Matter

5 pages

Scientific paper

10.1016/j.ssc.2005.01.019

We observe signatures of stimulated bosonic scattering of excitons, a precursor of Bose-Einstein-Condensation (BEC), in the photoluminescence of semiconductor quantum wells. The optical decay of a spinless molecule of two excitons (biexciton) into an exciton and a photon with opposite angular momenta is subject to bosonic enhancement in the presence of other excitons. In a spin polarized gas of excitons the bosonic enhancement breaks the symmetry of two equivalent decay channels leading to circularly polarized luminescence of the biexciton with the sign opposite to the excitonic luminescence. Comparison of experiment and many body theory proves stimulated scattering of excitons, but excludes the presence of a fully condensed BEC-like state.

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