Journal
NEW JOURNAL OF PHYSICS
Volume 21, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab151e
Keywords
antiferromagnet; fermions; cavity; self-ordering
Categories
Funding
- Austrian Science Fund FWF [SFB FoQuS F4013]
- ESQ fellowship of the Austrian Academy of Sciences (OAW)
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We explore the density and spin self-ordering of driven spin-1 /2 collisionless fermionic atoms coupled to the electromagnetic fields of a ring resonator. The two spin states are two-photon Raman-coupled via a pair of degenerate counterpropagating cavity modes and two transverse pump fields. In this one-dimensional configuration the coupled atom-field system possesses a continuous U(1) translational symmetry and a discrete Z(2) spin inversion symmetry. At half filling for sufficiently strong pump strengths, the combined U(1) X Z(2) symmetry is spontaneously broken at the onset of a superradiant phase transition to a state with self-ordered density and spin structures. We predominately find an antiferromagnetic lattice order at the cavity wavelength. The self-ordered states exhibit unexpected positive momentum pair correlations between fermions with opposite spin. These strong cavity-mediated correlations vanish at higher pump strength.
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