Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)
HL 20.13: Poster
Montag, 16. März 2015, 15:00–20:00, Poster B
Impact of disorder on the coherence of a polariton condensate in dependence on the temperature — Martin Thunert1, •Stefan Lange1, Helena Franke1, Chris Sturm1, Alexander Janot2, Bernd Rosenow2, M. Dolores Martín3, Luis Viña3, Marius Grundmann1, and Rüdiger Schmidt-Grund1 — 1Uni Leipzig, Inst. für Exp. Physik II, Linnéstr. 5, 04103 Leipzig — 2Uni Leipzig, Inst. für Theor. Physik, Brüderstr. 16, 04103 Leipzig — 3Universidad Autónoma de Madrid, Departamento de Física de Materiales, C/ Francisco Tomás y Valiente, n* 7, 28049 Madrid, Spain
We report on the impact of disorder on the coherence proterties of an exciton-polariton Bose-Einstein condensate (BEC) in a ZnO-based bulk planar microcavity (MC). In general, disorder leads to reduced long-range correlations of the BEC, which may eventually result in frequency desynchronization or even in spatially separated condensate fragments. In our MC, the momentum space intensity distribution of the BEC emission is strongly affected by disorder even at high excitation powers and for a wide range of temperatures and detunings. We found theoretically that this lack of BEC stabilization relies on the driven dissipative nature of the condensate, leading to disorder-induced density-independent phase fluctuations. We analyzed the interference pattern of the condensate emission pattern in momentum space for excitation powers slightly above the condensation threshold and a large range of temperatures up to 160 K. These measurements show that the emission from a certain energy state arises from a temporally coherent condensate rather than of uncorrelated BEC fragments.