Details
| Original language | English |
|---|---|
| Pages (from-to) | 171-176 |
| Number of pages | 6 |
| Journal | Solid State Communications |
| Volume | 134 |
| Issue number | 3 |
| Publication status | Published - 28 Jan 2005 |
Abstract
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 gas of biexcitons and spin polarized excitons the bosonic enhancement breaks the symmetry of two equivalent biexciton decay channels leading to circularly polarized luminescence of the biexciton with the sign opposite to the circularly polarized exciton luminescence. Comparison of experiment and many body theory clearly indicates the existence of stimulated exciton-scattering, but excludes the presence of a fully condensed BEC-like state.
Keywords
- A. Semiconductor, D. Bose-Einstein-Condensation, E. Stimulated scattering
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Materials Chemistry
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In: Solid State Communications, Vol. 134, No. 3, 28.01.2005, p. 171-176.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence
AU - Hägele, Daniel
AU - Pfalz, Stefan
AU - Oestreich, Michael
N1 - Funding information: We gratefully acknowledge discussions with M. Baranov, Raymond Chiao, and A. Knorr, as well as support by W.W. Rühle and H. Kalt in the early stage of this work. The work is supported by the DFG (German Science Foundation) and the BMBF.
PY - 2005/1/28
Y1 - 2005/1/28
N2 - 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 gas of biexcitons and spin polarized excitons the bosonic enhancement breaks the symmetry of two equivalent biexciton decay channels leading to circularly polarized luminescence of the biexciton with the sign opposite to the circularly polarized exciton luminescence. Comparison of experiment and many body theory clearly indicates the existence of stimulated exciton-scattering, but excludes the presence of a fully condensed BEC-like state.
AB - 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 gas of biexcitons and spin polarized excitons the bosonic enhancement breaks the symmetry of two equivalent biexciton decay channels leading to circularly polarized luminescence of the biexciton with the sign opposite to the circularly polarized exciton luminescence. Comparison of experiment and many body theory clearly indicates the existence of stimulated exciton-scattering, but excludes the presence of a fully condensed BEC-like state.
KW - A. Semiconductor
KW - D. Bose-Einstein-Condensation
KW - E. Stimulated scattering
UR - http://www.scopus.com/inward/record.url?scp=14744285422&partnerID=8YFLogxK
U2 - 10.1016/j.ssc.2005.01.019
DO - 10.1016/j.ssc.2005.01.019
M3 - Article
AN - SCOPUS:14744285422
VL - 134
SP - 171
EP - 176
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 3
ER -