Stability of Bose Einstein condensates of hot magnons in YIG

Details Stability of Bose Einstein condensates of hot magnons in YIG Stability of Bose Einstein condensates of hot magnons in YIG

2007-11-10

arxiv.org/abs/0711.1574v1

Physics

Condensed Matter

Other Condensed Matter

Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.257202

We investigate the stability of the recently discovered room temperature Bose-Einstein condensate (BEC) of magnons in Ytrrium Iron Garnet (YIG) films. We show that magnon-magnon interactions depend strongly on the external field orientation, and that the BEC in current experiments is actually metastable - it only survives because of finite size effects, and because the BEC density is very low. On the other hand a strong field applied perpendicular to the sample plane leads to a repulsive magnon-magnon interaction; we predict that a high-density magnon BEC can then be formed in this perpendicular field geometry.

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