Stability of Bose-Einstein Condensates of Hot Magnons in Yttrium Iron Garnet Films
I. S. TupitsynPacific Institute of Theoretical Physics, University of British Columbia, 6224 Agricultural Road, Vancouver, BC Canada, V6T 1Z1P. C. E. StampPacific Institute of Theoretical Physics, University of British Columbia, 6224 Agricultural Road, Vancouver, BC Canada, V6T 1Z1Alexander L. BurinDepartment of Chemistry, Tulane University, New Orleans, Louisiana 70118, USA
2008en
ABI
Annotatsiya
We investigate the stability of the recently discovered room-temperature Bose-Einstein condensate (BEC) of magnons in yttrium iron garnet 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 room-temperature magnon BEC should then form in this perpendicular field geometry.
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