Angular topological superfluid and topological vortex in an ultracold Fermi gas
arXiv:2201.12486 · doi:10.1103/PhysRevResearch.4.033023
Abstract
We show that pairing in an ultracold Fermi gas under spin-orbital-angular-momentum coupling (SOAMC) can acquire topological characters encoded in the quantized angular degrees of freedom. The resulting topological superfluid is the angular analog of its counterpart in a one-dimensional Fermi gas with spin-orbit coupling, but characterized by a Zak phase defined in the angular-momentum space. Upon tuning the SOAMC parameters, a topological phase transition occurs, which is accompanied by the closing of the quasiparticle excitation gap. Remarkably, a topological vortex state can also be stabilized by deforming the Fermi surface, which is topologically non-trivial in both the coordinate and angular-momentum space, offering interesting potentials for applications in quantum information and quantum control. We discuss how the topological phase transition and the exotic vortex state can be detected experimentally.
5+2 pages, 5+1 figures
References in corpus (13)
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Degenerate Quantum Gases with Spin-Orbit Coupling
- Manipulating Topological Edge Spins in One-Dimensional Optical Lattice
- Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields
- Spin - orbital-angular-momentum coupling in Bose-Einstein condensates
- Angular spin-orbit coupling in cold atoms
- Topologically non-trivial superconductivity in spin-orbit coupled systems: Bulk phases and quantum phase transitions
- Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas
- Quantum phases of Bose-Einstein condensates with synthetic spin - orbital-angular-momentum coupling
- Majorana fermions in one-dimensional spin-orbit coupled Fermi gases
- Pairing Superfluidity in Spin-Orbit Coupled Ultracold Fermi Gases
- Symmetry breaking and phase transitions in Bose-Einstein condensates with spin-orbital-angular-momentum coupling
Cited by in corpus (6)
- Spin-orbital-angular-momentum-coupled quantum gases
- Molecular state in a spin-orbital-angular-momentum coupled Fermi gas
- Dynamic structure factor of two-dimensional Fermi superfluid with Rashba spin-orbit coupling
- Dynamic generation of superflow in a fermionic ring through phase imprinting
- Two atoms in a harmonic trap with spin-orbital-angular-momentum coupling
- Dynamically generating superflow in a bosonic ring via phase imprinting