Exotic superfluidity in spin-orbit coupled Bose-Einstein condensates

Abstract

We study the superfluidity of a spin-orbit coupled Bose-Einstein condensate (BEC) by computing its Bogoliubov excitations, which are found to consist of two branches: one is gapless and phonon-like at long wavelength; the other is typically gapped. These excitations imply a superfluidity that has two new features: ({\it i}) due to the absence of the Galilean invariance, one can no longer define the critical velocity of superfluidity independent of the reference frame; ({\it ii}) the superfluidity depends not only on whether the speed of the BEC exceeds a critical value, but also on {\it cross helicity} that is defined as the direction of the cross product of the spin and the kinetic momentum of the BEC.

6 pages, 5 figures

References in corpus (12)

• Spin-Orbit Coupled Spinor Bose-Einstein Condensates
• Collective Dipole Oscillation of a Spin-Orbit Coupled Bose-Einstein Condensate
• Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark states
• Spin-orbit coupled weakly interacting Bose-Einstein condensates in harmonic traps
• Trapped two-dimensional condensates with synthetic spin-orbit coupling
• Spin-orbit coupled Bose-Einstein condensates
• Superfluidity of Bose-Einstein Condensate in An Optical Lattice: Landau-Zener Tunneling and Dynamical Instability
• Generalized Rashba spin-orbit coupling for cold atoms
• Non-equilibrium spin dynamics in a trapped Fermi gas with effective spin-orbit interaction
• Emergent patterns in a spin-orbit coupled spin-2 Bose-Einstein condensate
• Berry Phase Effect on Exciton Transport and Bose Einstein Condensate
• Superfluidity of Bose-Einstein condensates in toroidal traps with nonlinear lattices

Cited by in corpus (67)

• Degenerate Quantum Gases with Spin-Orbit Coupling
• Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensate
• Bright solitons in spin-orbit-coupled Bose-Einstein condensates
• Experimental Determination of the Finite-Temperature Phase Diagram of a Spin-Orbit Coupled Bose Gas
• Spin-orbit coupled Bose-Einstein condensates in a one-dimensional optical lattice
• Bose-Einstein Condensates in Spin-Orbit Coupled Optical Lattices: Flat Bands and Superfluidity
• Gap Solitons in Spin-Orbit-Coupled Bose-Einstein Condensates in Optical Lattices
• Stable multi-ring and rotating solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates with a radially-periodic potential
• Supercurrent and dynamical instability of spin-orbit-coupled ultracold Bose gases
• Localization of a spin-orbit coupled Bose-Einstein condensate in a bichromatic optical lattice
• Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas
• Phase separation in a spin-orbit coupled Bose-Einstein condensate
• Bright solitons in a 2D spin-orbit-coupled dipolar Bose-Einstein condensate
• Superfluid Density of a Spin-orbit Coupled Bose Gas
• Tunable spin-orbit coupled Bose-Einstein condensates in deep optical lattices
• Quantum solitons in spin-orbit-coupled Bose-Bose mixtures
• Diffused vorticity and moment of inertia of a spin-orbit coupled Bose-Einstein condensate
• Coherently Coupled Mixtures of Bose-Einstein Condensed Gases
• Quantum depletion and superfluid density of a supersolid in Raman spin-orbit coupled Bose gases
• Spin current generation and relaxation in a quenched spin-orbit-coupled Bose-Einstein condensate
• Critical spin superflow in a spinor Bose-Einstein condensate
• Bright solitons in a spin-tensor-momentum-coupled Bose-Einstein condensate
• Topological Fulde-Ferrell Superfluids of a Spin-Orbit Coupled Fermi Gas
• Spontaneous symmetry breaking in a spin-orbit coupled $f=2$ spinor condensate
• Superfluidity and Stabilities of a Bose-Einstein condensate with periodically modulated interatomic interaction
• Superfluid Breakdown and Multiple Roton Gaps in Spin-Orbit Coupled Bose-Einstein Condensates on an Optical Lattice
• Ground-state phase diagram and critical temperature of two-component Bose gases with Rashba spin-orbit coupling
• Moving obstacle potential in a spin-orbit-coupled Bose-Einstein condensate
• Topological Condensate in an Interaction Induced Gauge Potential
• Spin-orbit-coupling induced localization in the expansion of an interacting Bose-Einstein condensate
• Experimental realization of a non-magnetic one-way spin switch
• Quenching dynamics of the bright solitons and other localized states in spin-orbit coupled Bose-Einstein condensates
• Probing the Flat Band of Optically-Trapped Spin-Orbital Coupled Bose Gases Using Bragg Spectroscopy
• Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generation
• Landau versus Spin Superfluidity in Spinor Bose-Einstein Condensates
• Drag force on a moving impurity in a spin-orbit coupled Bose-Einstein condensate
• Quantum Dynamical Phase Transition in a Spin-Orbit Coupled Bose Condensate
• Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling
• Oblique breathers generated by a flow of two-component Bose-Einstein condensate past a polarized obstacle
• Superfluidity of Bose-Einstein condensates in ultracold atomic gases
• Plane and Stripe Wave Phases of a Spin-Orbit Coupled Bose-Einstein Condensate in an Optical Lattice with a Zeeman Field
• Metastable supersolid in spin-orbit coupled Bose-Einstein condensates
• Vortices and vortex states in Rashba spin-orbit-coupled condensates
• Superfluidity of a Raman spin-orbit-coupled Bose gas at finite temperature
• Topological defects of spin-orbit coupled Bose-Einstein condensates in a rotating anharmonic trap
• Emergence of unstable avoided crossing in the collective excitations of spin-1 spin-orbit coupled Bose-Einstein condensates
• Hydrodynamics of Normal Atomic Gases with Spin-orbit Coupling
• Two-fluid theory for superfluid system with anisotropic effective masses
• Motion of an Impurity in a Bose-Einstein Condensate with Weyl Spin-Orbit Coupling: Non-collinear Drag Force and Anisotropic Critical Velocity
• Superfluidity breakdown of periodic matter waves in quasi one-dimensional annular traps via resonant scattering with moving defects
• Drag force and superfluidity in the supersolid stripe phase of a spin-orbit-coupled Bose-Einstein condensate
• Detection of roton and phonon excitations in a spin-orbit coupled Bose-Einstein condensate with a moving barrier
• Supercurrent-carrying supersolid in spin-orbit-coupled Bose-Einstein condensates
• Ground states of dipolar spin-orbit-coupled Bose-Einstein condensates in a toroidal trap
• Three-dimensional solitons in Rydberg-Dressed cold atomic gases with spin-orbit coupling
• Evidence for correlated states in a cluster of bosons with Rashba spin-orbit coupling
• Unidirectional spin transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $\delta$-potential well
• Lattice dynamics in an emergent Zeeman lattice
• Patterning by dynamically unstable spin-orbit-coupled Bose-Einstein condensates
• Collective Oscillations of Bose-Einstein Condensates in a Synthetic Magnetic Field
• Double unstable avoided crossings and complex domain patterns formation in spin-orbit coupled spin-1 condensates
• Dragging spin-orbit-coupled solitons by a moving optical lattice
• Band-edge superfluid of Bose-Einstein condensates in the spin-orbit-coupled Zeeman lattice
• Chiral Quantum Droplet in a Spin-Orbit Coupled Bose Gas
• Ferromagnetic to antiferromagnetic transition of one-dimensional spinor Bose gases with spin-orbit coupling
• Hydrodynamic equations for a U(N) invariant superfluid
• Effect of Rashba spin-orbit and Rabi couplings on the excitation spectrum of binary Bose-Einstein condensates