Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: Exciton polaritons and their condensates (HL, jointly with TT)

HL 71.5: Vortrag

Donnerstag, 14. März 2013, 10:30–10:45, H2

Optically and structurally trapped exciton-polariton systems — •Tom Michalsky, Helena Franke, Chris Sturm, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig

The formation and properties of exciton-polaritons in microcavities (MCs) have been intensively investigated in the last years, since they can undergo a Bose-Einstein condensation (BEC). In this work we present the investigation of the momentum and spatial distribution of polaritons in the uncondensed as well as in the condensed phase for planar ZnO-based MCs with a wedge-shaped cavity layer and also in mesa structures. In the mesa structures we found an enhancement of the trapping as a result of the reduced potential energy therein. For MCs without mesa structures we demonstrate the manipulation of propagation of condensed polaritons. It turns out that for small negative detuning values the condensate is trapped by the excitation laser spot whereas for larger negative detunings an acceleration of the polaritons out of the pumping region accompanied by ballistic propagation [1] is observed.

[1] M. Wouters, I. Carusotto and C. Ciuti, Phys. Rev. B 77, 115340 (2008)