Tian Chuan, Chen Linqi, Zhang Yingjun, Zhu Liqing, Hu Wenping, Pan Yichun, Wang Zheng, Zhang Fangxin, Zhang Long, Dong Hongxing, Zhou Weihang
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China.
Nano Lett. 2022 Apr 13;22(7):3026-3032. doi: 10.1021/acs.nanolett.2c00235. Epub 2022 Mar 28.
We report the observation of coherent oscillations in the relaxation dynamics of an exciton-polariton condensate that were driven by parametric scattering processes. As a result of the interbranch scattering scheme and the nonlinear polariton-polariton interactions, such parametric scatterings exhibit a high scattering efficiency that leads to the fast depletion of the polariton condensate and the 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, including many excitation pulses, are clearly visible in our time-integrated images, implying the high stability of the relaxation oscillations driven by polariton parametric scatterings.
我们报告了由参量散射过程驱动的激子-极化激元凝聚体弛豫动力学中的相干振荡观测结果。由于分支间散射方案和非线性极化激元-极化激元相互作用，这种参量散射表现出高散射效率，导致极化激元凝聚体的快速耗尽和玻色子激发过程的周期性关闭，最终引起弛豫振荡。利用极化激元-库相互作用，时域中的振荡动力学可以投影到能量空间。理论上，我们使用开放耗散格罗斯-皮塔耶夫斯基方程的模拟与实验观测结果非常吻合。令人惊讶的是，在我们的时间积分图像中可以清楚地看到包括许多激发脉冲在内的振荡模式，这意味着由极化激元参量散射驱动的弛豫振荡具有高稳定性。
