Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit-coupled Fulde-Ferrell superfluid

Cao, Ye; Liu, Xia -Ji; He, Lianyi; Long, Gui -Lu; Hu, Hui

doi:10.1103/PhysRevA.91.023609

Title: Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit-coupled Fulde-Ferrell superfluid

Journal Article · Mon Feb 09 00:00:00 EST 2015 · Physical Review A - Atomic, Molecular, and Optical Physics

DOI:https://doi.org/10.1103/PhysRevA.91.023609· OSTI ID:1246948

Cao, Ye ^[1]; Liu, Xia -Ji ^[2]; He, Lianyi ^[3]; Long, Gui -Lu ^[4]; Hu, Hui ^[2]

Swinburne Univ. of Technology, Melbourne (Australia); Tsinghua Univ., Beijing (China)
Swinburne Univ. of Technology, Melbourne (Australia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (People's Republic of China); Tsinghua National Lab. for Information Science and Technology, Beijing (People's Republic of China)

We theoretically investigate the superfluid density and Berezinskii-Kosterlitz-Thouless (BKT) transition of a two-dimensional Rashba spin-orbit-coupled atomic Fermi gas with both in-plane and out-of-plane Zeeman fields. It was recently predicted that, by tuning the two Zeeman fields, the system may exhibit different exotic Fulde-Ferrell (FF) superfluid phases, including the gapped FF, gapless FF, gapless topological FF, and gapped topological FF states. Due to the FF paring, we show that the superfluid density (tensor) of the system becomes anisotropic. When an in-plane Zeeman field is applied along the x direction, the tensor component along the y direction n_s,yy is generally larger than n_s,xx in most parameter space. At zero temperature, there is always a discontinuity jump in n_s,xx as the system evolves from a gapped FF into a gapless FF state. With increasing temperature, such a jump is gradually washed out. The critical BKT temperature has been calculated as functions of the spin-orbit-coupling strength, interatomic interaction strength, and in-plane and out-of-plane Zeeman fields. We predict that the novel FF superfluid phases have a significant critical BKT temperature, typically at the order of 0.1T_F, where T_F is the Fermi degenerate temperature. Furthermore, their observation is within the reach of current experimental techniques in cold-atom laboratories.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FT140100003; FT130100815; DP140103231; DP140100637; 11175094; 91221205; AC52-06NA25396

OSTI ID:: 1246948

Alternate ID(s):: OSTI ID: 1180966

Report Number(s):: LA-UR-14-27977; PLRAAN

Journal Information:: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, Issue 2; ISSN 1050-2947

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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