Bose-Einstein Condensation of Magnons and Spin Superfluidity in the Polar Phase of HE 3

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

Organisaatiot

  • Lancaster University
  • Russian Academy of Sciences
  • Moscow Institute of Physics and Technology
  • Landau Institute for Theoretical Physics

Kuvaus

The polar phase of He3, which is topological spin-triplet superfluid with the Dirac nodal line in the spectrum of Bogoliubov quasiparticles, has been recently stabilized in a nanoconfined geometry. We pump magnetic excitations (magnons) into the sample of polar phase and observe how they form a Bose-Einstein condensate, revealed by coherent precession of the magnetization of the sample. Spin superfluidity, which supports this coherence, is associated with the spontaneous breaking of U(1) symmetry by the phase of precession. We observe the corresponding Nambu-Goldstone boson and measure its mass emerging when applied rf field violates the U(1) symmetry explicitly. We suggest that the magnon BEC in the polar phase is a powerful probe for topological objects such as vortices and solitons and topological nodes in the fermionic spectrum.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli025303
Sivut1-6
JulkaisuPhysical Review Letters
Vuosikerta121
Numero2
TilaJulkaistu - 12 heinäkuuta 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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