Interaction-Tuned Anderson versus Mott Localization.
Interaction-Tuned Anderson versus Mott Localization.
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DOI：
10.1103/physrevlett.117.146601
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发表时间：
2016-05
影响因子：
8.6
通讯作者：
A. Antipov;Younes Javanmard;P. Ribeiro;S. Kirchner
中科院分区：
文献类型：
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作者：
A. Antipov;Younes Javanmard;P. Ribeiro;S. Kirchner
无序或足够强的相互作用会使金属状态变得不稳定，导致它变成绝缘态。尽管这两种途径的相互作用导致电导率消失一直是一个中心研究课题，但到目前为止还没有出现统一的图景。在这里，我们建立了二维Falicov-Kimball模型，这是强电子关联的最简单的晶格模型之一，确实允许研究这种相互作用。特别地，我们证明了该模型在粒子-空穴对称性下具有三个不同的热力学绝缘相，并表现出Anderson局域化。由于弱局域化的存在，以前报道的金属相被认为是有限尺寸的特征。我们通过它们的电子态密度、交错占据、电导率和广义逆参与比来表征这些相。文中还讨论了我们的发现对其他强关联系统的影响。
Disorder or sufficiently strong interactions can render a metallic state unstable, causing it to turn into an insulating one. Despite the fact that the interplay of these two routes to a vanishing conductivity has been a central research topic, a unifying picture has not emerged so far. Here, we establish that the two-dimensional Falicov-Kimball model, one of the simplest lattice models of strong electron correlation, does allow for the study of this interplay. In particular, we show that this model at particle-hole symmetry possesses three distinct thermodynamic insulating phases and exhibits Anderson localization. The previously reported metallic phase is identified as a finite-size feature due to the presence of weak localization. We characterize these phases by their electronic density of states, staggered occupation, conductivity, and the generalized inverse participation ratio. The implications of our findings for other strongly correlated systems are discussed.