Superfluidity of Total Angular Momentum

Abstract

Spontaneous symmetry breaking of a U(1) symmetry in interacting systems leads to superfluidity of a corresponding conserved charge. We generalize the superfluidity to systems with U(1) symmetries acting on both matter fields and 2D spatial coordinates. Such systems can be effectively realized in easy-plane ferromagnetic systems with spin-orbit coupling where the conserved charge is a total angular momentum. We clarify that under a steady injection of spin angular momentum, the superfluid of the total angular momentum shows spacetime oscillations of the spin density and geometry-dependent spin hydrodynamics. We also demonstrate that the steady spin injection destabilizes the superfluid of total angular momentum, causing a dissipation effect in its spin hydrodynamic properties. Although a stability analysis shows that the superfluid under the spin injection is nonideal, the unique spin-transport features persist with weak dissipation of the spin angular momentum. Our study broadens the comprehension of superfluidity and sheds new light on the interplay between symmetries and phases of matter.

34 pages

References in corpus (21)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
• Degenerate Quantum Gases with Spin-Orbit Coupling
• Spin-Orbit Coupled Spinor Bose-Einstein Condensates
• Spin-orbit coupled Bose-Einstein condensates
• Excitonic superfluid phase in Double Bilayer Graphene
• Unified Description of Nambu-Goldstone Bosons without Lorentz Invariance
• Spin currents and spin superfluidity
• Superfluid spin transport through antiferromagnetic insulators
• Superfluid Spin Transport through Easy-Plane Ferromagnetic Insulators
• Experimental Signatures of Spin Superfluid Ground State in Canted Antiferromagnet Cr2O3 via Nonlocal Spin Transport
• On the number of Nambu-Goldstone bosons and its relation to charge densities
• Spin-dependent Cooper Pair Phase and Pure Spin Supercurrents in Strongly Polarized Ferromagnets
• Effective Lagrangian for Nonrelativistic Systems
• Interplay of exciton condensation and quantum spin Hall effect in InAs/GaSb bilayers
• Paired Superfluidity and Fractionalized Vortices in Spin-orbit Coupled Bosons
• Direct detection of pure spin-current by x-ray pump-probe measurements
• Ordered phase and scaling in $Z_n$ models and the three-state antiferromagnetic Potts model in three dimensions
• Condensation transition of ultracold Bose gases with Rashba spin-orbit coupling
• Spin phase regulated spin Josephson supercurrent in topological superconductor
• Dissipationless Spin-Charge Conversion in Excitonic Pseudospin Superfluid