Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 95: Polaritons

HL 95.1: Vortrag

Donnerstag, 3. April 2014, 11:30–11:45, POT 051

Influence of disorder on polariton BEC — •Martin Thunert¹, Alexander Janot², Chris Sturm¹, Helena Franke¹, Bernd Rosenow², Rüdiger Schmidt-Grund¹, and Marius Grundmann¹ — ¹Universität Leipzig, Fakultät für Experimentelle Physik II, Linnestr. 5, 04103 Leipzig — ²Universität Leipzig, Fakultät für Theoretische Physik, Brüderstr. 16, 04103 Leipzig

We discuss the impact of disorder effects on the dynamics of exciton-polariton Bose-Einstein condensates (BEC) in a ZnO-based bulk planar microcavity. In contrast to previous experimental work [1], we do not observe significant stabilization of the condensate with increasing polariton density and find even at high excitation powers strong traces of disorder effects in the momentum space intensity distributions. Recent theoretical work shows that disorder destroys the spatial long-range order of a driven quantum condensate [2]. Moreover, the superfluid stiffness of a driven condensate vanishes in the thermodynamic limit and a rigid behaviour is expected over finite length scales only. This indicates that disorder has a significantly pronounced impact on a polariton condensate compared to an equilibrium condensate. We simulate the polariton emission in the momentum space for a large number of disorder realisations. For a condensate phase fluctuation length comparable to the condensate size, our simulations allow us to understand the experimental findings and reproduce its qualitative behaviour for increasing excitation power.

[1] A. Baas et al., Phys. Rev. Lett. 100, 170401 (2008); [2] A. Janot et al., arXiv:1307.1407 (2013)