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arXiv 1004.0304cond-mat.other
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有限温度下的玻色-费米-哈伯德模型

Bose-Fermi-Hubbard model at finite temperature

T S Mysakovych

摘要:

本文在自洽无规相近似的框架下研究了玻色-费米-哈伯德模型描述的系统在有限温度下的相变。考虑了硬核玻色子的情况,并使用了赝旋形式。在无规相近似下计算了密度-密度相关函数,研究了超流相到超固相转变的可能性。结果表明,均匀和电荷有序相之间的过渡可以是第二或第一顺序,这取决于系统参数。

英文摘要:

The phase transitions at finite temperatures in the systems described by the Bose-Fermi-Hubbard model are investigated in this work in the framework of the selfconsistent random phase approximation. The case of the hard-core bosons is considered and pseudospin formalism is used. The density-density correlator is calculated in the random phase approximation and the possibilities of transitions from superfluid to supersolid phases are investigated. It is shown that the transitions between uniform and charge ordered phases can be of the second or the first order, depending on the system parameters.

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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