Jheng Shih-Da, Chen Ting-Wei, Cheng Szu-Cheng
Opt Express. 2022 Sep 26;30(20):35325-35337. doi: 10.1364/OE.468330.
We theoretically study an exciton-polariton condensate trapped in a harmonic potential with an annular pump. With a circular pump, predictions were made for a spontaneous rotating vortex lattice packed by singly quantized vortices. If the circular pump is replaced by an annular pump, singly quantized vortices are absorbed into the central hole and form a multiply quantized vortex. For a sufficiently narrow annular width, all vortices are absorbed into the central hole, ultimately forming a giant vortex with supersonic circular supercurrents flowing around it. Vortex-antivortex pairs can be generated if a defect is present in these supersonic circular supercurrents. We further discover that the motion of the vortex-antivortex pairs depends on the position at which they were generated. We suggest that this property can be used to control whether the velocity of the circular supercurrents is above or below the sound velocity.
我们从理论上研究了一种被环形泵浦的谐波势阱捕获的激子极化激元凝聚体。对于圆形泵浦，曾预测会形成由单量子化涡旋堆积而成的自发旋转涡旋晶格。如果将圆形泵浦替换为环形泵浦，单量子化涡旋会被吸收到中心孔中并形成多量子化涡旋。对于足够窄的环形宽度，所有涡旋都会被吸收到中心孔中，最终形成一个周围有超音速圆形超流环绕的巨型涡旋。如果这些超音速圆形超流中存在缺陷，就会产生涡旋 - 反涡旋对。我们进一步发现，涡旋 - 反涡旋对的运动取决于它们产生的位置。我们认为，这一特性可用于控制圆形超流的速度是高于还是低于声速。
