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Selective Mott Transition And Heavy Fermions

机译:选择性莫特跃迁和重费米子

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摘要

Starting with an extended version of the Anderson lattice where the f electrons are allowed a weak dispersion, we examine the possibility of a Mott localization of the f electrons for a finite value of the hybridization V. We study the fluctuations at the quantum critical point (QCP) where the f electrons localize. We find that they are in the same universality class as for the Kondo breakdown QCP, with the following notable features. The quantum critical regime sees the appearance of an additional energy scale separating two universality classes, In the low energy regime, the fluctuations are dominated by massless gauge modes, while in the intermediate energy regime, the fluctuations of the modulus of the order parameter are the most relevant ones. In the latter regime, electric transport simplifies drastically, leading to a quasilinear resistivity in three dimensional and anomalous exponents lower than T in two dimensional. This rather unique feature of the quantum critical regime enables us to make experimentally testable predictions.
机译:从安德森晶格的扩展版本开始,在该版本中允许f电子弱分散,我们针对杂化V的有限值研究了f电子的Mott局部化的可能性。我们研究了量子临界点处的涨落( QCP)f电子所在的位置。我们发现它们与Kondo故障QCP处于相同的通用性级别,具有以下显着特征。量子临界态出现了将两个通用性类别分开的附加能级,在低能态中,波动由无质量规范模式主导,而在中能态中,阶跃参数的模量波动为最相关的。在后一种情况下,电传输被大大简化,导致三维电阻率呈准线性,而二维电阻率低于T。量子临界态的这一相当独特的特征使我们能够进行实验可检验的预测。

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