Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate
arXiv:1507.02471 · doi:10.1103/PhysRevX.5.031002
Abstract
We observe a spontaneous parity breaking bifurcation to a ferromagnetic state in a spatially trapped exciton-polariton condensate. At a critical bifurcation density under nonresonant excitation, the whole condensate spontaneously magnetizes and randomly adopts one of two elliptically polarized (up to 95% circularly-polarized) states with opposite handedness of polarization. The magnetized condensate remains stable for many seconds at 5 K, but at higher temperatures it can flip from one magnetic orientation to another. We optically address these states and demonstrate the inversion of the magnetic state by resonantly injecting 100-fold weaker pulses of opposite spin. Theoretically, these phenomena can be well described as spontaneous symmetry breaking of the spin degree of freedom induced by different loss rates of the linear polarizations.
18 pages, 12 figures
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Cited by in corpus (4)
- Spin order and phase transitions in chains of polariton condensates
- Quantum entanglement in the spatial symmetry breaking phase transition of a driven-dissipative Bose-Hubbard dimer
- Spontaneous and Superfluid Chiral Edge States in Exciton-Polariton Condensates
- Angular dependence of giant Zeeman effect for semi-magnetic cavity polaritons