Controlling stability of Bose-Einstein condensation of interacting magnons in an antiferromagnet by an external magnetic field

Abstract

We propose a mechanism for destabilizing or stabilizing Bose-Einstein condensation (BEC) of interacting magnons in an antiferromagnet. We study how the interaction between magnons affects the magnon BEC in a two-sublattice antiferromagnet without and with an external magnetic field. We show that in the absence of the magnetic field the magnon BEC is destabilized by the attractive interband interaction, which is larger than the repulsive intraband interaction. We also show that in the presence of the magnetic field the magnon BEC is stabilized only if the magnetic field is large enough to make the intraband interaction larger than the interband interaction. Our results provide the first step for understanding the interaction effects on the magnon BEC in antiferromagnets and may open interaction physics of multicomponent BEC of magnons in magnets.

13 pages, 1 table; published version

References in corpus (3)

• Superfluid spin transport through antiferromagnetic insulators
• Stability of Bose Einstein condensates of hot magnons in YIG
• Magnon condensation into Q-ball in 3He-B

Cited by in corpus (5)

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• Interband magnon drag in ferrimagnetic insulators
• Stability of chiral magnon condensates in collinear antiferromagnetic insulators
• Mechanism for a Chemical Potential of Nonequilibrium Magnons in Parametric Parallel Pumping
• Topological switching in bilayer magnons via electrical control