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arXiv 0708.0910cond-mat.str-el
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有限温度下电荷有序态与二聚体-莫特绝缘体

Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures

Hideo Yoshioka, Masahisa Tsuchiizu, Hitoshi Seo

摘要:

通过研究具有库仑相互作用的二聚扩展Hubbard链,从理论上研究了四分之一填充准一维电子系统中有限温度下电荷有序态与Mott绝缘态之间的竞争.为了正确地考虑一维涨落,我们将玻色化方法应用于由链间平均场近似得到的有效模型。结果表明,晶格二聚化,特别是在临界区,以及链间库仑相互作用的受挫,降低了电荷有序相变温度,增大了二聚-莫特绝缘相。我们还导出了电荷有序相的奈特位移的一般公式,并讨论了它对实验的意义。

英文摘要:

We theoretically investigate the competition between charge-ordered state and Mott insulating state at finite temperatures in quarter-filled quasi-one-dimensional electron systems, by studying dimerized extended Hubbard chains with interchain Coulomb interactions. In order to take into account one-dimensional fluctuations properly, we apply the bosonization method to an effective model obtained by the interchain mean-field approximation. The results show that lattice dimerization, especially in the critical region, and frustration in the interchain Coulomb interactions reduce the charge-ordering phase transition temperature and enlarge the dimer-Mott insulating phase. We also derive a general formula of the Knight shift in the charge-ordered phase and its implication to experiments is discussed.

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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