Monday, September 3, 2012

1208.6540 (Stefan K. Baur et al.)

Ferromagnetism and Nematicity of Fermions in an Optical Flux Lattice    [PDF]

Stefan K. Baur, Nigel R. Cooper
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.
View original: http://arxiv.org/abs/1208.6540

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