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High-energy side-peak emission of exciton-polariton condensates in high density regime

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Horikiri_2016_HighEnergy_SREP_CC.pdf (1.199Mb)
Date
19/05/2016
Author
Horikiri, Tomoyuki
Yamaguchi, Makoto
Kamide, Kenji
Matsuo, Yasuhiro
Byrnes, Tim
Ishida, Natsuko
Löffler, Andreas
Hoefling, Sven
Shikano, Yutaka
Ogawa, Tetsuo
Forchel, Alfred
Yamamoto, Yoshihisa
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
NDAS
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Abstract
In a standard semiconductor laser, electrons and holes recombine via stimulated emission to emit coherent light, in a process that is far from thermal equilibrium. Exciton-polariton condensates -- sharing the same basic device structure as a semiconductor laser, consisting of quantum wells coupled to a microcavity -- have been investigated primarily at densities far below the Mott density for signatures of Bose-Einstein condensation. At high densities approaching the Mott density, exciton-polariton condensates are generally thought to revert to a standard semiconductor laser, with the loss of strong coupling. Here, we report the observation of a photoluminescence sideband at high densities that cannot be accounted for by conventional semiconductor lasing. This also differs from an upper-polariton peak by the observation of the excitation power dependence in the peak-energy separation. Our interpretation as a persistent coherent electron-hole-photon coupling captures several features of this sideband, although a complete understanding of the experimental data is lacking. A full understanding of the observations should lead to a development in non-equilibrium many-body physics.
Citation
Horikiri , T , Yamaguchi , M , Kamide , K , Matsuo , Y , Byrnes , T , Ishida , N , Löffler , A , Hoefling , S , Shikano , Y , Ogawa , T , Forchel , A & Yamamoto , Y 2016 , ' High-energy side-peak emission of exciton-polariton condensates in high density regime ' , Scientific Reports , vol. 6 , 25655 . https://doi.org/10.1038/srep25655
Publication
Scientific Reports
Status
Peer reviewed
DOI
https://doi.org/10.1038/srep25655
ISSN
2045-2322
Type
Journal article
Rights
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8837

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