Fermionic superfluidity and spontaneous superflows in optical lattices
Quantum Gases
2011-12-26 v1 Superconductivity
Abstract
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.
Cite
@article{arxiv.1112.5496,
title = {Fermionic superfluidity and spontaneous superflows in optical lattices},
author = {Shi-Jie Yang and Shiping Feng},
journal= {arXiv preprint arXiv:1112.5496},
year = {2011}
}
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4 figures