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arXiv 1602.08036cond-mat.str-elhep-lathep-ph
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$d$ =3+1量子XY模型的热力学

Thermodynamics of the $d$=3+1 Quantum XY Model

Christoph P. Hofmann

摘要:

在有效场论中,我们研究了$d$ =3+1量子XY模型在低温、弱磁场或交错磁场中的性质。对于这个参数政权只有少数结果似乎是已知的,而且被限制为一个循环的顺序。本文系统地研究了$d$ =3+1量子XY模型的热力学性质。在自由能量密度的低温展开中,$T^4$级的自由玻色气体项接受$T^6$和$T^8$级的修正。讨论还包括压力、(交错)磁化强度和磁化率。特别是,我们展示了这些量是如何受到自旋波相互作用的影响。然后,我们比较我们的发现与量子XY模型在$d$ =2+1。

英文摘要:

Within effective field theory we explore the properties of the $d$=3+1 quantum XY model at low temperatures and in weak magnetic or staggered fields. For this parameter regime only few results appear to be known, and furthermore are restricted to one-loop order. In the present study we systematically analyze the thermodynamics of the $d$=3+1 quantum XY model up to three-loop order. In the low-temperature expansion of the free energy density, the free Bose gas term of order $T^4$ receives corrections of order $T^6$ and $T^8$. The discussion also includes the pressure, (staggered) magnetization and susceptibility. In particular, we show how these quantities are influenced by the spin-wave interaction. We then compare our findings with those for the quantum XY model in $d$=2+1.

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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