2022/11/28 by E. B. Sonin, Sonin, E. B.
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.2211.15723
openalex publication_date 2022/11/28 · openalex created_date 2022/12/11 · openalex updated_date 2026/07/28
The phenomenon of superfluidity (superconductivity) is a possibility of transport of mass (charge) on macroscopical distances without essential dissipation. In magnetically ordered media with easy-plane topology of the order parameter space the superfluid transport of spin is also possible despite the absence of the strict conservation law for spin. The article addresses three key issues in the theory of spin superfluidity: topology of the order parameter space, Landau criterion for superfluidity, and decay of superfluid currents via phase slip events, in which magnetic vortices cross current streamlines. Experiments on detection of spin superfluidity are also surveyed.