Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.71: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Spatial and temporal evolution of coherent polariton modes in ZnO microwire cavities — Tom Michalsky, Marcel Wille, •Evgeny Krüger, Stefan Lange, Marius Grundmann, and Rüdiger Schmidt-Grund — Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany

We present experimental results for the spatial and ps-temporal evolution of coherent polariton states in ZnO based hexagonal microwires at room temperature. The estimation of the carrier density at the threshold excitation power reveals that the gain process is connected to the recombination out of an electron-hole plasma. The small spatial region of the cavity which is optically highly excited ensures together with a large intrinsic coupling constant of V≈300 meV that the cavities remain in the strong coupling regime as the highly excited region acts only as a small perturbation and source for the polariton population. We furthermore show that the model developed for the real- and k-space evolution of Bose-Einstein condensates based on the Gross-Pitaevskii equation [1] applies to our observations and gives similar results as obtained from nonlinear ray optics using a spatially varying particle density dependent refractive index for the cavity material.

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