arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.05889cond-mat.str-el
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一维扩展周期Anderson模型中Hund耦合与近藤效应的竞争

Competition between Hund's coupling and Kondo effect in a one-dimensional extended periodic Anderson model

I. Hagymasi, J. Solyom, O. Legeza

摘要:

我们研究了扩展的周期性安德森模型的基态性质,以了解使用密度矩阵重整化群算法的本地化和巡回电子之间的洪德耦合的作用。通过计算冯诺伊曼熵,我们发现在对称半满情况下,由于近藤效应和Hund耦合的竞争,随着杂化量的增加,出现了两个相变和两个新相.在由两个临界点限定的中间相中,我们发现了二聚的基态,而在其它空间均匀相中,基态分别为类Haldane和类Kondo单态.我们还通过计算互信息确定了系统的纠缠谱和纠缠图,从而阐明了各相的结构。

英文摘要:

We study the ground-state properties of an extended periodic Anderson model to understand the role of Hund's coupling between localized and itinerant electrons using the density-matrix renormalization group algorithm. By calculating the von Neumann entropies we show that two phase transitions occur and two new phases appear as the hybridization is increased in the symmetric half-filled case due to the competition between Kondo-effect and Hund's coupling. In the intermediate phase, which is bounded by two critical points, we found a dimerized ground state, while in the other spatially homogeneous phases the ground state is Haldane-like and Kondo-singlet-like, respectively. We also determine the entanglement spectrum and the entanglement diagram of the system by calculating the mutual information thereby clarifying the structure of each 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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