Spontaneous and triggered vortices in polariton optical-parametric-oscillator superfluids.
Spontaneous and triggered vortices in polariton optical-parametric-oscillator superfluids.
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DOI：
10.1103/physrevlett.105.063902
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发表时间：
2010-03
影响因子：
8.6
通讯作者：
F. Marchetti;M. Szymańska;C. Tejedor;D. Whittaker
中科院分区：
文献类型：
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作者：
F. Marchetti;M. Szymańska;C. Tejedor;D. Whittaker
我们利用具有泵浦和衰减的Gross-Pitaevskii方程研究了光学参量振荡器区域中的非平衡极化子超流体。我们确定了一个政权以上的光学参量振荡器的阈值，系统发生自发对称性破缺，是不稳定的旋涡形成没有任何旋转驱动器。稳定涡解不同于亚稳涡解;后者可以持续存在，但只能由外部触发。自发和触发涡的特点是由一个广义的愈合长度，指定的光参量振荡器参数。
We study nonequilibrium polariton superfluids in the optical-parametric-oscillator regime by using a Gross-Pitaevskii equation with pumping and decay. We identify a regime above the optical-parametric-oscillator threshold, where the system undergoes spontaneous symmetry breaking and is unstable towards vortex formation without any rotating drive. Stable vortex solutions differ from metastable ones; the latter can persist but can be triggered only externally. Both spontaneous and triggered vortices are characterized by a generalized healing length, specified by the optical-parametric-oscillator parameters only.