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arXiv · 2201.07585

Relaxation Oscillations of an Exciton-polariton Condensate Driven by Parametric Scattering

Chuan Tian·Linqi Chen·Yingjun Zhang·Liqing Zhu·Wenping Hu·Yichun Pan·Zheng Wang·Fangxin Zhang·Long Zhang·Hongxing Dong·Weihang Zhou
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Abstract

We report observation of coherent oscillations in the relaxation dynamics of an exciton-polariton condensate driven by parametric scattering processes. As a result of the interbranch scattering scheme and the nonlinear polariton-polariton interactions, such parametric scatterings exhibit high scattering efficiency, which leads to fast depletion of the polariton condensate and periodic shut-off of the bosonic stimulation processes, eventually causing relaxation oscillations. Employing polariton-reservoir interactions, the oscillation dynamics in the time domain can be projected onto the energy space. In theory, our simulations using the open-dissipative Gross-Pitaevskii equation are in excellent agreement with experimental observations. Surprisingly, the oscillation patterns are clearly visible in our time-integrated images including many excitation pulses, implying the high stability of the relaxation oscillations driven by polariton parametric scatterings.

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Chuan Tian, Linqi Chen, Yingjun Zhang, Liqing Zhu, Wenping Hu, Yichun Pan, Zheng Wang, Fangxin Zhang, Long Zhang, Hongxing Dong, Weihang Zhou. 2022-01-19. Relaxation Oscillations of an Exciton-polariton Condensate Driven by Parametric Scattering. https://doi.org/10.1021/acs.nanolett.2c00235

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