Spinor Self-Ordering of a Quantum Gas in a Cavity.

Autor:	Kroeze RM; Department of Physics, Stanford University, Stanford, California 94305, USA.; E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA., Guo Y; Department of Physics, Stanford University, Stanford, California 94305, USA.; E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA., Vaidya VD; Department of Physics, Stanford University, Stanford, California 94305, USA.; E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.; Department of Applied Physics, Stanford University, Stanford, California 94305, USA., Keeling J; SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS United Kingdom., Lev BL; Department of Physics, Stanford University, Stanford, California 94305, USA.; E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.; Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2018 Oct 19; Vol. 121 (16), pp. 163601.
DOI:	10.1103/PhysRevLett.121.163601
Abstrakt:	We observe the joint spin-spatial (spinor) self-organization of a two-component Bose-Einstein condensate (BEC) strongly coupled to an optical cavity. This unusual nonequilibrium Hepp-Lieb-Dicke phase transition is driven by an off-resonant 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.
Databáze:	MEDLINE
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