期刊
PHYSICAL REVIEW B
卷 79, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.054512
关键词
fermion systems; ferromagnetism; optical lattices; superfluidity
资金
- RGC grants of Hong Kong [HKU7012/06P, HKU7051/06P, HKU-3/05C]
- HKU, the National Natural Science Foundation of China [10429401, 10874032]
- State Key Programs of China [2006CB921800, 2009CB929204]
- Robert A. Welch Foundation [E-1146]
- Shanghai Municipal Education Commission
Superfluidity with imbalanced populations of harmonically trapped ultracold fermions in a two-dimensional optical lattice is investigated by solving the Bogoliubov-de Gennes equations. The intriguing richness of patterns between competing ferromagnetic and superfluid phases for different filling densities has been revealed. At low density, the main experimental features could be reproduced, especially the bimodal distribution of ferromagnetism. The superfluid-pairing gap oscillates radially, demonstrating the realization of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. In the high-density regime, another type of FFLO state with gap oscillation along the angular direction shows up and the accompanying ferromagnetic order modulates accordingly. The square lattice like FFLO state may appear at the intermediate densities. Moreover, we suggest other experimental proposals of observing the unique FFLO features straightforwardly.
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