Fulde-Ferrell-Larkin-Ovchinnikov Phases in Two-dimensional Spin-Orbit Coupled Degenerate Fermi Gases
arXiv:1212.6826 · doi:10.1038/srep06535
Abstract
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state with non-zero total momentum Cooper pairs in a strong magnetic field, was predicted more than 50 years ago and now becomes an important concept in many branches of physics. However, no unambiguous experimental evidences for the existence of FFLO phases have been observed yet. Recently, spin-imbalanced ultracold degenerate Fermi gases have emerged as a new powerful platform for the observation of FFLO phases due to their high experimental controllability and the lack of disorder. However, in three dimensional degenerate Fermi gases where the FFLO phases can be described within the simple mean field theory, the parameter region for the FFLO phases is too small to be observed in experiments. Recently, we showed that the Rashba type spin-orbit coupling and in-plane Zeeman field in three dimensional degenerate Fermi gases provide a more efficient way to create the FFLO phase because (1) the parameter region for the FFLO phase is greatly enlarged in the phase diagram and (2) the FFLO phase is stabilized due to the enhanced energy difference between FFLO phase and conventional Bardeen-Cooper-Schrieffer (BCS) phase. In this work we investigate the FFLO phase in two dimensional spin-orbit coupled degenerate Fermi gases using the mean field theory, with special concerns on the physical origin of the FFLO state. The basic properties of the FFLO phase are discussed and the phase diagram is obtained at zero temperature. The symmetry of different quantum phases is examined, which provide important basis for the experimental observation of FFLO phases using the time-of-flight imaging.
Presentations have been improved. A detailed comparison between cold atom and solid materials are provided explicitly
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Cited by in corpus (23)
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- Full proximity treatment of topological superconductors in Josephson-junction architectures
- Critical magnetic field of ultrathin superconducting films and interfaces
- Majorana fermions in quasi-1D and higher dimensional ultracold fermionic optical lattices
- Fulde-Ferrell States in Inverse Proximity Coupled Magnetically-Doped Topological Heterostructures
- Interplay between the extended s-wave symmetry of the gap and the spin-orbit coupling in the low-electron concentration regime of quasi-two-dimensional superconductors
- Spin-imbalanced ultracold Fermi gases in a two-dimensional array of tubes
- Superfluid weight and Berezinskii-Kosterlitz-Thouless temperature of spin-imbalanced and spin-orbit-coupled Fulde-Ferrell phases in lattice systems
- Dynamical instability towards finite-momentum pairing in quenched BCS superconducting phases
- Pairing properties of an odd-frequency superfluid Fermi gas
- Anderson Localization in Degenerate Spin-Orbit Coupled Fermi Gases with Disorder
- In-plane magnetic field-induced orbital FFLO superconductivity in twisted WSe homobilayers
- Fulde-Ferrell states in unequally charged Fermi gases
- Majorana Fermions in Semiconducting Nanowires on the Top of Fulde-Ferrell Superconductor
- Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in 2H-NbS2 flakes
- Precision thermodynamics of the strongly interacting Fermi gas in two dimensions
- Superfluidity enhanced by spin-flip tunnelling in the presence of a magnetic field
- Fulde-Ferrell superfluids in an asymmetric three-component Fermi Gas
- Structures and proximity effects of inhomogeneous population-imbalanced Fermi gases with pairing interactions
- Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gases
- Topological superfluids in two-dimensional Fermi gas with Rashba spin-orbit coupling