High-field instability of field-induced triplon Bose-Einstein condensate

Details High-field instability of field-induced triplon Bose-Einstein condensate High-field instability of field-induced triplon Bose-Einstein condensate

2009-05-29

arxiv.org/abs/0905.4817v2

Phys. Rev. B 81, 020407(R) (2010)

Physics

Condensed Matter

Quantum Gases

published version

Scientific paper

We study properties of magnetic field-induced Bose-Einstein condensate of triplons as a function of temperature and the field within the Hartree-Fock-Bogoliubov approach including the anomalous density. We show that the magnetization is continuous across the transition, in agreement with the experiment. In sufficiently strong fields the condensate becomes unstable due to triplon-triplon repulsion. As a result, the system is characterized by two critical magnetic fields: one producing the condensate and the other destroying it. We show that nonparabolic triplon dispersion arising due to the gapped bare spectrum and the crystal structure has a strong influence on the phase diagram.

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