@article{AmthorWeissenseelFischeretal.2014,
  author    = {Amthor, Matthias and Weißenseel, Sebastian and Fischer, Julian and Kamp, Martin and Schneider, Christian and H{\"o}fling, Sven},
  title     = {Electro-optical switching between polariton and cavity lasing in an InGaAs quantum well microcavity},
  doi       = {10.1364/OE.22.031146},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-111130},
  year      = {2014},
  abstract  = {We report on the condensation of microcavity exciton polaritons under optical excitation in a microcavity with four embedded InGaAs quantum wells. The polariton laser is characterized by a distinct nonlinearity in the input-output-characteristics, which is accompanied by a drop of the emission linewidth indicating temporal coherence and a characteristic persisting emission blueshift with increased particle density. The temporal coherence of the device at threshold is underlined by a characteristic drop of the second order coherence function to a value close to 1. Furthermore an external electric field is used to switch between polariton regime, polariton condensate and photon lasing.},
  language  = {en}
}
@article{WinklerFischerSchadeetal.2015,
  author    = {Winkler, Karol and Fischer, Julian and Schade, Anne and Amthor, Matthias and Dall, Robert and Geßler, Jonas and Emmerling, Monika and Ostrovskaya, Elena A. and Kamp, Martin and Schneider, Christian and H{\"o}fling, Sven},
  title     = {A polariton condensate in a photonic crystal potential landscape},
  series = {New Journal of Physics},
  volume    = {17},
  journal   = {New Journal of Physics},
  doi       = {10.1088/1367-2630/17/2/023001},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-125050},
  pages     = {023001},
  year      = {2015},
  abstract  = {The possibility of investigating macroscopic coherent quantum states in polariton condensates and of engineering polariton landscapes in semiconductors has triggered interest in using polaritonic systems to simulate complex many-body phenomena. However, advanced experiments require superior trapping techniques that allow for the engineering of periodic and arbitrary potentials with strong on-site localization, clean condensate formation, and nearest-neighbor coupling. Here we establish a technology that meets these demands and enables strong, potentially tunable trapping without affecting the favorable polariton characteristics. The traps are based on a locally elongated microcavity which can be formed by standard lithography. We observe polariton condensation with non-resonant pumping in single traps and photonic crystal square lattice arrays. In the latter structures, we observe pronounced energy bands, complete band gaps, and spontaneous condensation at the M-point of the Brillouin zone.},
  language  = {en}
}
@article{KochereshkoDurnevBesombesetal.2016,
  author    = {Kochereshko, Vladimir P. and Durnev, Mikhail V. and Besombes, Lucien and Mariette, Henri and Sapega, Victor F. and Askitopoulos, Alexis and Savenko, Ivan G. and Liew, Timothy C. H. and Shelykh, Ivan A. and Platonov, Alexey V. and Tsintzos, Simeon I. and Hatzopoulos, Z. and Savvidis, Pavlos G. and Kalevich, Vladimir K. and Afanasiev, Mikhail M. and Lukoshkin, Vladimir A. and Schneider, Christian and Amthor, Matthias and Metzger, Christian and Kamp, Martin and Hoefling, Sven and Lagoudakis, Pavlos and Kavokin, Alexey},
  title     = {Lasing in Bose-Fermi mixtures},
  series = {Scientific Reports},
  volume    = {6},
  journal   = {Scientific Reports},
  number    = {20091},
  doi       = {10.1038/srep20091},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-168152},
  year      = {2016},
  abstract  = {Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.},
  language  = {en}
}