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VOLUME 87 | ISSUE 11 | PAGE 736
Phonons in magnon superfluid and symmetry breaking field
G. E. Volovik
Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland
Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia


PACS: 03.75.Kk, 47.37.+q, 67.30.Hj
Abstract
Recent experiments [11volov-PhononMass,11volov-Skyba] which measured the spectrum of the Goldstone collective mode of coherently precessing state in 3He-B are discussed using the presentation of the coherent spin precession in terms of the Bose-Einstein condensation of magnons. The mass in the spectrum of the Goldstone boson - phonon in the superfluid magnon liquid - is induced by the symmetry breaking field, which is played by the RF magnetic field.


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