Fermionic superfluidity and spontaneous superflows in optical lattices

Details Fermionic superfluidity and spontaneous superflows in optical lattices Fermionic superfluidity and spontaneous superflows in optical lattices

2011-12-23

arxiv.org/abs/1112.5496v1

New J. phys. 12,023032(2009)

Physics

Condensed Matter

Quantum Gases

4 figures

Scientific paper

We study superfluidity of strongly repulsive fermionic atoms in optical lattices. The atoms are paired up through a correlated tunneling mechanism, which induces superfluidity when repulsive nearest-neighbor interactions are included in the Hubbard model. This paired superfluid is a metastable state which persists for a long time as the pair-broken process is severely suppressed. The mean-field phase diagram and low energy excitations are investigated in a square lattice system. Intriguingly, spontaneous superflows may appear in the ground state of a triangular optical lattice system due to antiferromagnetic frustration.

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