@article{HorikiriYamaguchiKamideetal.2016,
  author    = {Horikiri, Tomoyuki and Yamaguchi, Makoto and Kamide, Kenji and Matsuo, Yasuhiro and Byrnes, Tim and Ishida, Natsuko and L{\"o}ffler, Andreas and H{\"o}fling, Sven and Shikano, Yutaka and Ogawa, Tetsuo and Forchel, Alfred and Yamamoto, Yoshihisa},
  title     = {High-energy side-peak emission of exciton-polariton condensates in high density regime},
  series = {Scientific Reports},
  volume    = {6},
  journal   = {Scientific Reports},
  number    = {25655},
  doi       = {10.1038/srep25655},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-167711},
  year      = {2016},
  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.},
  language  = {en}
}