Ioffe Institute,Russian Academy of Sciences, 26 Politechnicheskaya, St-Petersburg, Russia, 194021.
Spin Optics Laboratory, St. Petersburg State University, Ulyanovskaya 1, St. Petersburg, Russia, 198504.
Sci Rep. 2023 Mar 21;13(1):4607. doi: 10.1038/s41598-023-31520-z.
Concentric ring exciton polariton condensates emerging under non-resonant laser pump in an annular trapping potential support persistent circular currents of polaritons. The trapping potential is formed by a cylindrical micropillar etched in a semiconductor microcavity with embedded quantum wells and a repulsive cloud of optically excited excitons under the pump spot. The symmetry of the potential is subject to external control via manipulation by its pump-induced component. In the manuscript, we demonstrate excitation of concentric ring polariton current states with predetermined vorticity which we trace using interferometry measurements with a spherical reference wave. We also observe the polariton condensate dynamically changing its vorticity during observation, which results in pairs of fork-like dislocations on the time-averaged interferogram coexisting with azimuthally homogeneous photoluminescence distribution in the micropillar.
同心环激子极化激元凝聚体在非共振激光泵浦下出现在环形俘获势中，支持极化激元的持续圆电流。俘获势由半导体微腔中的圆柱形微柱刻蚀形成，微腔中嵌入量子阱，并在泵浦点下形成光激发激子的排斥云。通过其泵浦诱导分量的操纵，势的对称性受到外部控制。在本文中，我们演示了同心环极化激元电流状态的激发，我们使用具有球形参考波的干涉测量来跟踪其涡度。我们还观察到极化激元凝聚体在观察过程中动态地改变其涡度，这导致在时间平均干涉图上存在叉状的位错对，同时在微柱中存在各向同性的光致发光分布。
