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Quantum fluctuations and stability of vortex lattices in a nonresonantly pumped exciton-polariton condensate
Ting-Wei Chen1, Shih-Da Jheng2, T F Jiang2
1Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan, Republic of China.
Abstract:
The dynamics of an exciton-polariton condensate (EPC) subject to harmonic confinement can cause spontaneously formed vortices to arrange into a triangular vortex lattice. The stability of such a spontaneously formed vortex lattice is still unknown. We investigate the quantum fluctuations of vortex lattices in a rapidly rotating EPC with a rotation frequency close to the harmonic trap. In such a large condensate, we find that a vortex lattice with a triangular structure is stable, whereas one with a square structure becomes unstable. This result indicates that a driven-dissipative vortex array with strong quantum fluctuations can occur in an EPC.
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