FFLO and Topological Superfluid Phases in 2D Spin-Orbit Coupling Fermionic Optical Lattices

ORAL

Abstract

We investigate the phase diagram of 2D spin-orbit coupled ultra-cold Fermi atoms confined in a square lattice. By numerically solving the corresponding Bogoliubov-de Gennes equation self-consistently, we show that a finite Zeeman field can induce Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) and /or topological superfluid phases (which support Majorana fermions) in the presence of spin-orbit coupling. We find that the perpendicular Zeeman field favors the topological superfluid phase, while the in-plane Zeeman field favors the FFLO state. A simple physical explanation for the above results is also provided.

*This work is supported by ARO, AFOSR, and NSF.

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Authors

  • Yong Xu

    • The University of Texas at Dallas

  • Chunlei Qu

    • The University of Texas at Dallas

  • Ming Gong

    • Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080 USA
    • Washington State University
    • Department of Physics, the University of Texas at Dallas
    • The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080

  • Chuanwei Zhang

    • The University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080