Parametric relaxation in whispering gallery mode exciton-polariton condensates

C. P. Dietrich*, R. Johne, T. Michalsky, C. Sturm, P. Eastham, H. Franke, M. Lange, M. Grundmann, R. Schmidt-Grund

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Polariton condensation of one-dimensional multimode whispering gallery mode exciton polaritons is investigated in hexagonal ZnO microwires at cryogenic temperatures. At threshold, stimulated scattering is fed by the resonant emission from highly populated defect-bound excitons. With further increasing excitation power, condensates relax within the multimode whispering gallery mode polariton ladder, leading to their effective evaporative cooling. The relaxation is a parametric polariton-polariton scattering process evidenced by its intensity, energy, and momentum evolution. The experimental observations are in good agreement with numerical simulations based on a model for polariton-polariton scattering extended to the multimodal whispering gallery mode system.

Original languageEnglish
Article number041202
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Issue number4
Publication statusPublished - 16 Jan 2015


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