Superfluid Density of a Spin-orbit Coupled Bose Gas

Abstract

We discuss the superfluid properties of a Bose-Einstein condensed gas with spin-orbit coupling, recently realized in experiments. We find a finite normal fluid density ${\rho }_n$ at zero temperature which turns out to be a function of the Raman coupling. In particular, the entire fluid becomes normal at the transition point from the zero momentum to the plane wave phase, even though the condensate fraction remains finite. We emphasize the crucial role played by the gapped branch of the elementary excitations and discuss its contributions to various sum rules. Finally, we prove that an independent definition of superfluid density ${\rho }_s$, using the phase twist method, satisfies the equality ${\rho }_n+{\rho }_s=\rho$, the total density, despite the breaking of Galilean invariance.

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• The dipolar Bose-Hubbard model
• Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate
• Diffused vorticity and moment of inertia of a spin-orbit coupled Bose-Einstein condensate
• Self-bound supersolid stripe phase in binary Bose-Einstein condensates
• 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
• Observation of anisotropic superfluid density in an artificial crystal
• Supersolid Stripes Enhanced by Correlations in a Raman Spin-Orbit-Coupled System
• Spin-orbit-coupling induced localization in the expansion of an interacting Bose-Einstein condensate
• Superfluid density and collective modes of fermion superfluid in dice lattice
• Experimental realization of a non-magnetic one-way spin switch
• Finite Temperature Phases of Two Dimensional Spin-Orbit Coupled Bosons
• Landau's criterion for an anisotropic Bose-Einstein condensate
• Quantum-geometric perspective on spin-orbit-coupled Bose superfluids
• Bosons with incommensurate potential and spin-orbit coupling
• Superfluidity of a Raman spin-orbit-coupled Bose gas at finite temperature
• Generalized Josephson relation for conserved charges in multi-component bosons
• Probing supersolidity through excitations in a spin-orbit-coupled Bose-Einstein condensate
• Two-fluid theory for superfluid system with anisotropic effective masses
• Unidirectional spin transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $\delta$-potential well
• Superfluid density, Josephson relation and pairing fluctuations in a multi-component fermion superfluid
• Quantum corrections to a spin-orbit coupled Bose-Einstein Condensate
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Lattice dynamics in an emergent Zeeman lattice
• Spin Hall mode in a trapped thermal Rashba gas
• Collective Oscillations of Bose-Einstein Condensates in a Synthetic Magnetic Field
• Phase space curvature in spin-orbit coupled ultracold atom systems
• Dynamics of Supersolid state: normal fluid, superfluid, and supersolid velocities
• Modulation of spin-orbit coupled Bose-Einstein condensates: analytical characterization of acceleration-induced transitions between energy bands
• Band-edge superfluid of Bose-Einstein condensates in the spin-orbit-coupled Zeeman lattice
• Supersolid phase of a spin-orbit-coupled Bose-Einstein condensate: a perturbation approach
• Hydrodynamic equations for a U(N) invariant superfluid