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

15 Citations (Scopus)
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Abstract

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
Volume91
Issue number4
DOIs
Publication statusPublished - 16 Jan 2015

Keywords

  • Semiconductor microcavities
  • Zinc-oxide
  • Vortices

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