Parametric relaxation in whispering gallery mode exciton-polariton condensates
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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.
Dietrich , C P , Johne , R , Michalsky , T , Sturm , C , Eastham , P , Franke , H , Lange , M , Grundmann , M & Schmidt-Grund , R 2015 , ' Parametric relaxation in whispering gallery mode exciton-polariton condensates ' Physical Review. B, Condensed matter and materials physics , vol 91 , no. 4 , 041202 . DOI: 10.1103/PhysRevB.91.041202
Physical Review. B, Condensed matter and materials physics
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This work has been supported by Leipzig School of Natural Sciences BuildMoNa (GS 185/1), the European Social Fund (ESF) within Nachwuchsforschergruppe “Multiscale functional structures,” and DFG-FOR1616 (SCHM2710/2-1,P1) “Dynamics and Interactions of Semiconductor Nanowires for Optoelectronics.”