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      Berezinskii-Kosterlitz-Thouless phase transition in 2D spin-orbit-coupled Fulde-Ferrell superfluids.

      1 , 1
      Physical review letters
      American Physical Society (APS)

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          Abstract

          The experimental observation of traditional Zeeman-field induced Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids has been hindered by various challenges, in particular, the requirement of low dimensional systems. In 2D, finite temperature phase fluctuations lead to an extremely small Berezinskii-Kosterlitz-Thouless (BKT) transition temperature for FFLO superfluids, raising serious concerns regarding their experimental observability. Recently, it was shown that FFLO superfluids can be realized using a Rashba spin-orbit coupled Fermi gas subject to Zeeman fields, which may also support topological excitations such as Majorana fermions in 2D. Here we address the finite temperature BKT transition issue in this system, which may exhibit gapped, gapless, topological, and gapless topological FF phases. We find a large BKT transition temperature due to large effective superfluid densities, making it possible to observe 2D FF superfluids at finite temperature. In addition, we show that gapless FF superfluids can be stable due to their positive superfluid densities. These findings pave the way for the experimental observation of 2D gapped and gapless FF superfluids and their associated topological excitations at finite temperature.

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          Author and article information

          Journal
          Phys. Rev. Lett.
          Physical review letters
          American Physical Society (APS)
          1079-7114
          0031-9007
          Mar 20 2015
          : 114
          : 11
          Affiliations
          [1 ] Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA.
          Article
          10.1103/PhysRevLett.114.110401
          25839244
          38f44a44-675f-4a30-8666-973ff88fc4af

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