Spinor self-ordering of a quantum gas in a cavity
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We observe the joint spin-spatial (spinor) self-organization of a two-component BEC strongly coupled to an optical cavity. This unusual nonequilibrium Hepp-Lieb-Dicke phase transition is driven by an off-resonant two-photon Raman transition formed from a classical pump field and the emergent quantum dynamical cavity field. This mediates a spinor-spinor interaction that, above a critical strength, simultaneously organizes opposite spinor states of the BEC on opposite checkerboard configurations of an emergent 2D lattice. The resulting spinor density-wave polariton condensate is observed by directly detecting the atomic spin and momentum state and by holographically reconstructing the phase of the emitted cavity field. The latter provides a direct measure of the spin state, and a spin-spatial domain wall is observed. The photon-mediated spin interactions demonstrated here may be engineered to create dynamical gauge fields and quantum spin glasses.
Kroeze , R M , Guo , Y , Vaidya , V D , Keeling , J & Lev , B L 2018 , ' Spinor self-ordering of a quantum gas in a cavity ' , Physical Review Letters , vol. 121 , no. 16 , 163601 . https://doi.org/10.1103/PhysRevLett.121.163601
Physical Review Letters
© 2018 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.121.163601
DescriptionFunding: J. K. acknowledges support from SU2P.
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