Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence

Daniel Hägele; Stefan Pfalz; Michael Oestreich

doi:10.1016/j.ssc.2005.01.019

Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence

Daniel Hägele^*
, Stefan Pfalz
, Michael Oestreich

^*Corresponding author for this work

Institute of Solid State Physics

Research output: Contribution to journal › Article › Research › peer review

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.

Original language	English
Pages (from-to)	171-176
Number of pages	6
Journal	Solid State Communications
Volume	134
Issue number	3
DOIs	https://doi.org/10.1016/j.ssc.2005.01.019
Publication status	Published - 28 Jan 2005

Keywords

A. Semiconductor
D. Bose-Einstein-Condensation
E. Stimulated scattering

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2005.01.019

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@article{3caf34dea8a84ebb9f849be7a6d6815e,

title = "Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence",

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",

author = "Daniel H{\"a}gele and Stefan Pfalz and Michael Oestreich",

note = "Funding information: We gratefully acknowledge discussions with M. Baranov, Raymond Chiao, and A. Knorr, as well as support by W.W. R{\"u}hle and H. Kalt in the early stage of this work. The work is supported by the DFG (German Science Foundation) and the BMBF.",

year = "2005",

month = jan,

day = "28",

doi = "10.1016/j.ssc.2005.01.019",

language = "English",

volume = "134",

pages = "171--176",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd.",

number = "3",

}

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 - https://www.scopus.com/pages/publications/14744285422

U2 - 10.1016/j.ssc.2005.01.019

DO - 10.1016/j.ssc.2005.01.019

M3 - Article

AN - SCOPUS:14744285422

SN - 0038-1098

VL - 134

SP - 171

EP - 176

JO - Solid State Communications

JF - Solid State Communications

IS - 3

ER -

Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence

Abstract

Keywords

ASJC Scopus subject areas

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