1112.0972 (Krzysztof Sacha et al.)

Frustration and time reversal symmetry breaking for Fermi and Bose-Fermi
systems    [PDF]

Krzysztof Sacha, Katarzyna Targonska, Jakub Zakrzewski

The modulation of an optical lattice potential that breaks time-reversal symmetry enables the realization of complex tunneling amplitudes in the corresponding tight-binding model. For a superfluid Fermi gas in a triangular lattice potential with complex tunnelings the pairing function acquires a complex phase, so the frustrated magnetism of fermions can be realized.Bose-Fermi mixture of bosonic molecules and unbound fermions in the lattice shows also an interesting behavior. Due to boson-fermion coupling, the fermions become slaved by the bosons and the corresponding pairing function takes the complex phase determined by bosons.

View original: http://arxiv.org/abs/1112.0972