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arXiv 0902.1993cond-mat.stat-mechcond-mat.quant-gascond-mat.supr-con
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两粒子Bose-哈伯德模型的磁相变

Magnetic phases and transitions of the two-species Bose-Hubbard model

Stephen Powell

摘要:

本文研究了非零温度下两种玻色子在晶格中运动的模型,重点研究了磁序和超流-绝缘体相变。首先,朗道理论被用来找到的相图的一般结构,特别是证明存在的一阶转变和滞后在附近的一个多临界点。其次,一个明确的热力学相图计算方法的基础上的一个领域的理论描述的玻色-哈伯德模型,其中包括粒子数波动的关键影响。磁有序莫特绝缘体的最大转变温度被发现是有限的超流相的存在。

英文摘要:

A model of two-species bosons moving on the sites of a lattice is studied at nonzero temperature, focusing on magnetic order and superfluid-insulator transitions. Firstly, Landau theory is used to find the general structure of the phase diagram, and in particular to demonstrate the presence of first-order transitions and hysteresis in the vicinity of a multicritical point. Secondly, an explicit thermodynamic phase diagram is calculated using an approach based on a field-theoretical description of the Bose-Hubbard model, which incorporates the crucial effects of particle-number fluctuations. The maximum transition temperature to a magnetically ordered Mott insulator is found to be limited by the presence of the superfluid phase.

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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