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

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Horikiri T,Yamaguchi M,Kamide K,Matsuo Y,Byrnes T,Ishida N,Löffler A,Höfling S,Shikano Y,Ogawa T,Forchel A,Yamamoto Y

doi

10.1038/srep25655

subject

Has Abstract

pub_date

2016-05-19 00:00:00

pages

25655

issn

2045-2322

pii

srep25655

journal_volume

6

pub_type

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