Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid 28049, Spain.
Phys Rev Lett. 2010 Aug 6;105(6):063902. doi: 10.1103/PhysRevLett.105.063902. Epub 2010 Aug 4.
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.
我们通过使用带有泵浦和衰减的 Gross-Pitaevskii 方程来研究光学参量振荡器区域中的非平衡极化子超流体。我们确定了光学参量振荡器阈值以上的一个区域，在该区域中，系统会发生自发对称破缺，并且在没有任何旋转驱动的情况下对涡旋形成不稳定。稳定的涡旋解与亚稳定的涡旋解不同；后者可以持续存在，但只能通过外部触发。自发和触发的涡旋都具有广义的愈合长度，仅由光学参量振荡器参数指定。
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