论文标题
通过强磁波动从金属绝缘体转变中消除轨道选择性
Eliminating Orbital Selectivity from the Metal-Insulator Transition by Strong Magnetic Fluctuations
论文作者
论文摘要
轨道选择性电子行为是多轨系统中强电子相关性最显着的表现之一。一个突出的例子是轨道选择性Mott Transition（OSMT），其特征在于某些轨道中的局部电子以及其他轨道中的巡游电子。 OSMT在两维系统中的最先进的理论描述基于通过动态平均场理论或从属旋转方法提供的局部非扰动近似对电子相关性的近似。在这项工作中，我们超越了这一本地情况，并专注于空间集体电子波动对OSMT的影响。为了这个目标，我们考虑了一个有两个具有不同带宽的轨道的立方晶格上的半填充哈伯德 - 卡纳莫里模型。我们表明，该系统固有的强磁波动阻止了OSMT并有利于在两个轨道上在相同的临界温度下发生的Néel转变。
The orbital-selective electronic behavior is one of the most remarkable manifestations of strong electronic correlations in multi-orbital systems. A prominent example is the orbital-selective Mott transition (OSMT), which is characterized by the coexistence of localized electrons in some orbitals, and itinerant electrons in other orbitals. The state-of-the-art theoretical description of the OSMT in two- and three-dimensional systems is based on local non-perturbative approximations to electronic correlations provided by dynamical mean-field theory or slave spin method. In this work we go beyond this local picture and focus on the effect of spatial collective electronic fluctuations on the OSMT. To this aim, we consider a half-filled Hubbard-Kanamori model on a cubic lattice with two orbitals that have different bandwidths. We show that strong magnetic fluctuations that are inherent in this system prevent the OSMT and favor the Néel transition that occurs at the same critical temperature for both orbitals.
