2007/08/05 by Yu. M. Bunkov, Yuriy M. Bunkov, G. E. Volovik +1 · 8 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.other
paper · pdf · doi:10.1007/s10909-007-9530-7
published as J. Low Temp. Phys. 150 (2008) 135-144 · 10 pages, 5 figures, prepared for proceedings of QFS-2007, JLTP style
arxiv created 2007/08/05 · openalex publication_date 2007/11/26 · crossref created 2007/11/26 · crossref issued 2007/11/27 · crossref published 2007/11/27 · crossref published-online 2007/11/27 · crossref published-print 2008/02/01 · arxiv updated 2009/12/01 · crossref deposited 2019/06/02 · openalex created_date 2025/10/10 · crossref indexed 2026/07/26 · openalex updated_date 2026/08/01
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 two new modes of the coherent precession in compressed aerogel. In compressed aerogel the coherent precession has been also found in 3He-A. 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.