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arXiv 0905.4817cond-mat.quant-gascond-mat.stat-mech
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场致三体玻色-爱因斯坦凝聚体的高场不稳定性

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

Abdulla Rakhimov, E. Ya. Sherman, Chul Koo Kim

摘要:

利用Hartree-Fock-Bogoliubov方法研究了磁场诱导的三重子玻色-爱因斯坦凝聚体的性质与温度和场的关系,包括反常密度.我们表明,磁化是连续的过渡,与实验一致。在足够强的电场中,由于三体-三体排斥,凝聚态变得不稳定。结果表明,该系统具有两个临界磁场:一个产生凝聚态,另一个破坏凝聚态.我们发现,由于裸能谱和晶体结构引起的非抛物型三重子色散对相图有很大的影响.

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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