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arXiv 0808.0877cond-mat.str-el
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二维Anderson-Mott相变中的局域矩和磁序

Local moments and magnetic order in the two-dimensional Anderson-Mott transition

Maria Elisabetta Pezzoli, Federico Becca, Michele Fabrizio, Giuseppe Santoro

摘要:

我们研究了无序二维模型中电子关联的作用,通过使用变分波函数,可以插入安德森和莫特绝缘体之间。在这种方法中,安德森-莫特转变可以在顺磁和磁扇区中描述。在后一种情况下,我们发现的证据形成的本地磁矩,顺序之前的莫特过渡。莫特绝缘体中的电荷间隙开口伴随着$\lim_{q\to 0} \overline{< n_q>< n_{-q}>}$(条形表示杂质平均值)的消失,这与可压缩性波动有关。一个令人沮丧的(第二邻居)跳跃的作用也进行了讨论,特别强调形成亚稳态自旋玻璃态。

英文摘要:

We study the role of electronic correlation in a disordered two-dimensional model by using a variational wave function that can interpolate between Anderson and Mott insulators. Within this approach, the Anderson-Mott transition can be described both in the paramagnetic and in the magnetic sectors. In the latter case, we find evidence for the formation of local magnetic moments that order before the Mott transition. The charge gap opening in the Mott insulator is accompanied by the vanishing of the $\lim_{q\to 0} \overline{< n_q>< n_{-q}>}$ (the bar denoting the impurity average), which is related to the compressibility fluctuations. The role of a frustrating (second-neighbor) hopping is also discussed, with a particular emphasis to the formation of metastable spin-glass states.

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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