Stable Fulde-Ferrell-Larkin-Ovchinnikov pairing states in 2D and 3D optical lattices

ORAL

Abstract

We present the study of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states in the $p$-orbital bands in both two and three-dimensional optical lattices. Due to the quasi one-dimensional band structure which arises from the unidirectional hopping of the orthogonal $p$-orbitals, the pairing phase space is not affected by spin imbalance. Furthermore, interactions build up high dimensional phase coherence which stabilizes the FFLO states in 2D and 3D optical lattices in a large parameter regime in phase diagram. These FFLO phases are stable with imposing the inhomogeneous trapping potential. Their entropies are comparable to those of the normal states at finite temperatures.

*This work is supported by NSF-DMR0804775

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Authors

  • Zi Cai

    • The department of Physics, Univeristy of California, San Diego
    • UC San Diego
    • The Department of Physics, University of California, San Diego

  • Yupeng Wang

    • Institute of Physics, Chinese Academy of Sciences, Beijing, China
    • Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China

  • Congjun Wu

    • The department of Physics, Univeristy of California, San Diego
    • The Department of Physics, Univeristy of California, San Diego
    • The Department of Physics, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • UC San Diego
    • The Department of Physics, University of Science and Technology of China
    • University of California, San Diego