Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.12: Poster

Montag, 16. März 2015, 15:00–20:00, Poster B

Interference measurements on exciton-polariton Bose-Einstein Condensates — •Alexander Holm, Martin Thunert, Helena Franke, Chris Sturm, Tom Michalsky, Marius Grundmann, and Rüdiger Schmidt-Grund — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig, Germany

We report on interference measurements to investigate the coherence properties of exciton-polariton Bose-Einstein condensates (BECs) in a ZnO-based planar microcavity at T = 10 K. The photoluminescence signal of the Fourier plane was sent to a Michelson interferometer in mirror-retroreflector (RR) configuration. The RR image is a centrosymmetric counterpart of the mirror arm image. In the resulting interferogram we superimpose the emission with opposite wavevectors.

By means of analyzing the fringe visibility of the interferogram as a function of the path length difference of both interferometer arms, a BEC coherence time at least (500 ± 200) fs could be deduced. This is about four times larger than the BEC lifetime demonstrating the coherence conservation during the multiple reabsorption and reemission process of this quantum system.