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Bose-Einstein Condensation of Magnons in Superfluid 3He

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Abstract

The possibility of Bose-Einstein condensation of excitations has been discussed for a long time. The phenomenon of the phase-coherent precession of magnetization in superfluid 3He and the related effects of spin superfluidity are based on the true Bose-Einstein condensation of magnons. Several different states of coherent precession has been observed in 3He-B: homogeneously precessing domain (HPD); persistent signal formed by Q-balls at very low temperatures; coherent precession with fractional magnetization; and a mode of the coherent precession in compressed aerogel. The coherent precession has been also found in 3He-A in compressed aerogel. Here we demonstrate that all these cases are examples of a Bose-Einstein condensation of magnons, with the magnon interaction term in the Gross-Pitaevskii equation being provided by different types of spin-orbit coupling in the background of the coherent precession.

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Authors and Affiliations

  1. MCBT, Institute Neel, CNRS/UJF, Grenoble, 38042, France

    Yuriy M. Bunkov

  2. Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland

    Grigory E. Volovik

  3. L.D. Landau Institute for Theoretical Physics, Moscow, Russia

    Grigory E. Volovik

Authors
  1. Yuriy M. Bunkov
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  2. Grigory E. Volovik
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Correspondence to Yuriy M. Bunkov.

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Bunkov, Y.M., Volovik, G.E. Bose-Einstein Condensation of Magnons in Superfluid 3He. J Low Temp Phys 150, 135–144 (2008). https://doi.org/10.1007/s10909-007-9530-7

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  • DOI: https://doi.org/10.1007/s10909-007-9530-7

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