Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice
arXiv:1208.6540 · doi:10.1103/PhysRevLett.109.265301
Abstract
Ultracold atoms in Raman-dressed optical lattices allow for effective momentum-dependent interactions among single-species fermions originating from short-range s-wave interactions. These dressed-state interactions combined with very flat bands encountered in the recently introduced optical flux lattices push the Stoner instability towards weaker repulsive interactions, making it accessible with current experiments. As a consequence of the coupling between spin and orbital degrees of freedom, the magnetic phase features Ising nematic order.
arXiv comment5 pages, 4 figures (published version)
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