Exploring exotic superfluidity of polarized ultracold fermions in optical lattices

Journal Article · Sun Feb 01 04:00:00 EST 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.79.054512· OSTI ID:21192532

Yan, Chen ^[1]; Wang, Z D ^[2]; Zhang, F C ^[2]; Ting, C S ^[3]

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1. Department of Physics and Laboratory of Advanced Materials, Fudan University, Shanghai (China)
2. Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
3. Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204 (United States)

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.

• OSTI ID: 21192532
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 79; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DISTRIBUTION
EQUATIONS
FERMIONS
FERROMAGNETISM
INTERFERENCE
LASER RADIATION
OSCILLATIONS
STARK EFFECT
SUPERFLUIDITY
TEMPERATURE RANGE 0000-0013 K
TETRAGONAL LATTICES
TRAPPING
TWO-DIMENSIONAL CALCULATIONS