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

^*Korrespondierende*r Autor*in für diese Arbeit

Institut für Festkörperphysik

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › 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.

Originalsprache	Englisch
Seiten (von - bis)	171-176
Seitenumfang	6
Fachzeitschrift	Solid State Communications
Jahrgang	134
Ausgabenummer	3
DOIs	https://doi.org/10.1016/j.ssc.2005.01.019
Publikationsstatus	Veröffentlicht - 28 Jan. 2005

ASJC Scopus Sachgebiete

Allgemeine Chemie
Physik der kondensierten Materie
Werkstoffchemie

Zugriff auf Dokument

10.1016/j.ssc.2005.01.019

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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.",

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

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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 -