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Berezinskii-Kosterlitz-Thouless phase transition in 2D spin-orbit-coupled Fulde-Ferrell superfluids
1Department of Physics, The University of Texas at Dallas, Richardson, Texas 75080, USA.
Physical Review Letters
|April 4, 2015
Summary
Researchers explored Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids in 2D systems. They found a high Berezinskii-Kosterlitz-Thouless transition temperature, enabling experimental observation of these exotic states and Majorana fermions.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Superfluidity
Background:
- Experimental realization of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids is challenging, especially in 2D systems due to low transition temperatures.
- Finite temperature phase fluctuations severely limit the observability of 2D FFLO superfluids via the Berezinskii-Kosterlitz-Thouless (BKT) transition.
Purpose of the Study:
- Investigate the finite temperature Berezinskii-Kosterlitz-Thouless (BKT) transition in 2D Rashba spin-orbit coupled Fermi gases with Zeeman fields.
- Determine the feasibility of observing 2D FFLO superfluids and associated topological excitations at finite temperatures.
Main Methods:
- Theoretical analysis of a 2D Rashba spin-orbit coupled Fermi gas subjected to Zeeman fields.
- Investigation of gapped, gapless, topological, and gapless topological Fulde-Ferrell (FF) phases.
- Calculation of Berezinskii-Kosterlitz-Thouless (BKT) transition temperatures and superfluid densities.
Main Results:
- A significantly enhanced Berezinskii-Kosterlitz-Thouless (BKT) transition temperature was found due to large effective superfluid densities.
- Gapless Fulde-Ferrell (FF) superfluids demonstrate stability, attributed to their positive superfluid densities.
- The system supports various FF phases, including gapped, gapless, and topological states.
Conclusions:
- The proposed system offers a viable pathway for the experimental observation of 2D Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids at finite temperatures.
- This research facilitates the study of associated topological excitations, such as Majorana fermions, in experimentally accessible conditions.
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