title: Quantum fluctuations and stability of vortex lattices in a nonresonantly pumped exciton-polariton condensate.
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.
authors.affiliation: Department of Electrophysics, National Chiayi University, Chiayi 60004, Taiwan, Republic of China.
authors.forename: Ting-Wei
authors.initials: TW
authors.lastname: Chen
authors.forename: Shih-Da
authors.initials: SD
authors.lastname: Jheng
authors.forename: T F
authors.initials: TF
authors.lastname: Jiang
authors.forename: Szu-Cheng
authors.initials: SC
authors.lastname: Cheng