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Article Dans Une Revue Physics-Uspekhi Année : 2010

Spin superfluidity and magnons Bose-Einstein condensation

G. Volovik
  • Fonction : Auteur

Résumé

The spin superfluidity -- superfluidity in the magnetic subsystem of a condensed matter - is manifested as the spontaneous phase-coherent precession of spins first discovered in 1984 in 3He-B. This superfluid current of spins - spin supercurrent - is one more representative of superfluid currents known or discussed in other systems, such as the superfluid current of mass and atoms in superfluid 4He; superfluid current of electric charge in superconductors; superfluid current of hypercharge in Standard Model of particle physics; superfluid baryonic current and current of chiral charge in quark matter; etc. Spin superfluidity can be described in terms of the Bose condensation of spin waves - magnons. We discuss different phases of magnon superfluidity, including those in magnetic trap; and signatures of magnons superfluidity: (i) spin supercurrent, which transports the magnetization on a macroscopic distance more than 1 cm long; (ii) spin current Josephson effect which shows interference between two condensates; (iii) spin current vortex - a topological defect which is an analog of a quantized vortex in superfluids, of an Abrikosov vortex in superconductors, and cosmic strings in relativistic theories; (iv) Goldstone modes related to the broken U(1) symmetry - phonons in the spin-superfluid magnon gas; etc. We also touch the topic of spin supercurrent in general including spin Hall and intrinsic quantum spin Hall effects.

Dates et versions

hal-00995196 , version 1 (22-05-2014)

Identifiants

Citer

Yuriy M. Bunkov, G. Volovik. Spin superfluidity and magnons Bose-Einstein condensation. Physics-Uspekhi, 2010, 53, pp.848-853. ⟨10.3367/UFNE.0180.201008M.0884⟩. ⟨hal-00995196⟩

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