title: FFLO superfluids in 2D spin-orbit coupled Fermi gases.
abstract: We show that the combination of spin-orbit coupling and in-plane Zeeman field in a two-dimensional degenerate Fermi gas can lead to a larger parameter region for Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases than that using spin-imbalanced Fermi gases. The resulting FFLO superfluids are also more stable due to the enhanced energy difference between FFLO and conventional Bardeen-Cooper-Schrieffer (BCS) excited states. We clarify the crucial role of the symmetry of Fermi surface on the formation of finite momentum pairing. The phase diagram for FFLO superfluids is obtained in the BCS-BEC crossover region and possible experimental observations of FFLO phases are discussed.
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, USTC, Hefei, Anhui 230026, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: Department of Physics and Centre for Quantum Coherence, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Gong
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, USTC, Hefei, Anhui 230026, China.
authors.forename: Yichao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, USTC, Hefei, Anhui 230026, China.
authors.forename: Xubo
authors.initials: X
authors.lastname: Zou
authors.affiliation: Department of Physics, The University of Texas at Dallas, Richardson, TX, 75080 USA and.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Zhang
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, USTC, Hefei, Anhui 230026, China.
authors.forename: Guangcan
authors.initials: G
authors.lastname: Guo