TY  - JOUR
A1  - Horikiri, Tomoyuki
A1  - Yamaguchi, Makoto
A1  - Kamide, Kenji
A1  - Matsuo, Yasuhiro
A1  - Byrnes, Tim
A1  - Ishida, Natsuko
A1  - Löffler, Andreas
A1  - Höfling, Sven
A1  - Shikano, Yutaka
A1  - Ogawa, Tetsuo
A1  - Forchel, Alfred
A1  - Yamamoto, Yoshihisa
T1  - High-energy side-peak emission of exciton-polariton condensates in high density regime
JF  - Scientific Reports
N2  - 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.
KW  - side-peak emission
KW  - exciton-polariton condensates
KW  - standard semiconductor laser
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-167711
VL  - 6
IS  - 25655
ER  -