Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 95: Polaritons
HL 95.5: Vortrag
Donnerstag, 3. April 2014, 12:30–12:45, POT 051
Magnetic field properties of zero- and two-dimensional polariton-condensates — •Julian Fischer1, Sebastian Brodbeck1, Bo Zhang2, Alexander Chernenko3, Steffen Holzinger1, Matthias Amthor1, Vladimir D. Kulakovskii3, Lukas Worschech1, Mikhail Durnev4, Hui Deng2, Martin Kamp1, Christian Schneider1, Alexey V. Kavokin4, and Sven Höfling1,5 — 1Technische Physik, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Department of Physics, University of Michigan, Ann Arbor, Michigan, 48109, USA — 3Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432, Russia — 4Ioffe Physical-Technical Institute of RAS, 194021 St.-Petersburg, Russia — 5SUPA, School of Physics and Astronomy, University of St Andrews, UK
We discuss magnetic field properties of zero- (0D) and two-dimensional (2D) polariton-condensates in GaAs microcavities. For the 2D polariton-condensate we observe a sign reversal of the Zeeman-splitting above a critical magnetic field. This experimental result is explained by a nonequilibrium spin Meissner effect. In the second part we investigate the magnetic field response of 0D microcavity structure, where the three-dimensional photonic confinement is archieved by replacing the top distributed Bragg reflector by a sub-wavelength high index contrast grating. The emission characteristics are dominated by discrete, zero-dimensional resonances. Magnetic field investigations allow us to prove the matter part of the polariton-emission above the threshold by directly measuring the polariton’s diamagnetic shift.