Collective modes of spin-orbit coupled Fermi gases in the repulsive regime
arXiv:1212.0424 · doi:10.1103/PhysRevA.87.063623
Abstract
We investigate the collective modes in the spin-orbit coupled Fermi gas with repulsive s-wave interaction. The interplay between spin-orbit coupling and atom-atom interactions plays the crucial role in the collective behaviors of Fermi gas. In contrast with ordinary Fermi liquid, spin-orbit coupled Fermi gas has strongly correlated spin and density excitations. Within the scheme of random phase approximation, we classify collective modes based on the symmetry group and determine their properties via the poles of corresponding correlation functions. Besides, the particle-hole continuum is obtained, where the imaginary part of these correlation functions become non-vanishing. We make comparisons with collective excitations in the ordinary Fermi liquid without spin-orbit coupling and in a helical liquid, i.e., surface states of a three dimensional topological insulator. We also propose an experimental protocol for detecting these collective modes and discuss corresponding experimental signatures in the ultracold Fermi gases experiment.
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Cited by in corpus (16)
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- Theory of a chiral Fermi liquid: general formalism
- Spin-Orbit Coupling Induced Back-action Cooling in Cavity-Optomechanics with a Bose-Einstein Condensate
- Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling
- Pairing sizes in attractively interacting Fermi gases with Spin-orbit Couplings
- Raman Scattering by a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling
- Effective lattice model for collective modes in a Fermi liquid with spin-orbit coupling
- Collective spin modes in Fermi liquids with spin-orbit coupling
- Phase diagram, band structure and density of states in two-dimensional attractive Fermi-Hubbard model with Rashba spin-orbit coupling
- Coupled spin-charge dynamics in helical Fermi liquids beyond the random phase approximation
- Phonon-Induced Collective Modes in Spin-Orbit Coupled Polar Metals
- Damping of the Anderson-Bogolyubov mode by spin and mass imbalance in Fermi mixtures
- Spin-orbit coupled repulsive Fermi atoms in a one-dimensional optical lattice
- Itinerant magnetism in Weyl spin-orbit coupled Fermi gas
- Zero-field spin resonance in graphene with proximity-induced spin-orbit coupling