Bose-Einstein condensation of magnons in superfluid 3He

Details Bose-Einstein condensation of magnons in superfluid 3He Bose-Einstein condensation of magnons in superfluid 3He

2007-08-05

arxiv.org/abs/0708.0663v1

J. Low Temp. Phys. 150 (2008) 135-144

Physics

Condensed Matter

Other Condensed Matter

10 pages, 5 figures, prepared for proceedings of QFS-2007, JLTP style

Scientific paper

10.1007/s10909-007-9530-7

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.

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