Barrat J, Cherbunin Roman, Sedov Evgeny, Aladinskaia Ekaterina, Liubomirov Alexey, Litvyak Valentina, Petrov Mikhail, Zhou Xiaoqing, Hatzopoulos Z, Kavokin Alexey, Savvidis P G
Key Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, Westlake University, 600 Dunyu Road, Hangzhou, 310030, Zhejiang, China.
Institute of Natural Sciences, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, 310024, Zhejiang, China.
Sci Rep. 2024 Jun 5;14(1):12953. doi: 10.1038/s41598-024-63725-1.
We monitor the orbital degree of freedom of exciton-polariton condensates confined within an optical trap and unveil the stochastic switching of persistent annular polariton currents under pulse-periodic excitation. Within an elliptical trap, the low-lying in energy polariton current states manifest as a two-petaled density distribution with a swirling phase. In the stochastic regime, the density distribution, averaged over multiple excitation pulses, becomes homogenized in the azimuthal direction. Meanwhile, the weighted phase, extracted from interference experiments, exhibits two compensatory jumps when varied around the center of the trap. Introducing a supplemental control optical pulse to break the reciprocity of the system enables the transition from a stochastic to a deterministic regime, allowing for controlled polariton circulation direction.
我们监测了限制在光学陷阱内的激子-极化激元凝聚体的轨道自由度，并揭示了在脉冲周期激发下持续环形极化激元电流的随机切换。在椭圆形陷阱中，低能量极化激元电流状态表现为具有涡旋相位的两瓣密度分布。在随机状态下，多个激发脉冲平均后的密度分布在方位角方向上变得均匀。同时，从干涉实验中提取的加权相位在陷阱中心附近变化时会出现两个补偿性跳跃。引入一个补充控制光脉冲以打破系统的互易性，能够实现从随机状态到确定性状态的转变，从而实现对极化激元循环方向的控制。
