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

Abstract

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.

published version

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Cited by in corpus (13)

• On the anomalous density for Bose gases at finite temperature
• Behavior of the anomalous correlation function in uniform 2D Bose gas
• Difference in Bose-Einstein condensation of conserved and unconserved particles
• Macroscopic properties of triplon Bose-Einstein condensates
• Particle-hole symmetry breaking in a spin-dimer system TlCuCl${}_3$ observed at 100 T
• Bose - Einstein condensation of triplons with a weakly broken U(1) symmetry
• On Josephson effects in insulating spin systems
• Gr{ü}neisen parameter of quantum magnets with spin gap
• Quasiequilibrium Mixture of Itinerant and Localized Bose Atoms in Optical Lattice
• The effects of disorder in dimerized quantum magnets in mean field approximations
• Spin-gapped magnets with weak anisotropies I: Constraints on the phase of the condensate wave function
• Critical behavior of Tan's contact for bosonic systems with a fixed chemical potential
• Experimental tests for macroscopic phase coherence in magnetic-quasiparticle condensates of insulating spin systems