论文标题
相互作用和温度对Weyl液体磁光电导率的影响
Interaction and temperature effects on the magneto-optical conductivity of Weyl liquids
论文作者
论文摘要
负磁力是Weyl半法中手性异常的表现之一。磁光电导率还显示了与普通电子气体中未间隔的Landau水平之间的过渡。这种拓扑特性如何通过相互作用和温度来改变？我们通过研究具有现场哈伯德相互作用的Weyl Semimetals的晶格模型来回答这个问题。这种相互作用的Weyl半学被称为Weyl液体，可以在Mn $ _3 $ sn中实现。我们使用单位点动态平均场理论解决该模型。我们发现，在Weyl液体中，准粒子的特征是准粒子光谱$ z $，尽管随着频率接近零的寿命比在普通的费米液体中的速度更快。即使相互作用降低了DC电导率相对于所提交的磁性的线性依赖性的斜率，仍然存在负磁磁性。在升高的温度下，Weyl液体横断到不良金属行为，drude峰变得平坦且无特征。
Negative magnetoresistance is one of the manifestations of the chiral anomaly in Weyl semimetals. The magneto-optical conductivity also shows transitions between Landau levels that are not spaced as in an ordinary electron gas. How are such topological properties modified by interactions and temperature? We answer this question by studying a lattice model of Weyl semimetals with an on-site Hubbard interaction. Such an interacting Weyl semimetal, dubbed as Weyl liquid, may be realized in Mn$_3$Sn. We solve that model with single-site dynamical mean-field theory. We find that in a Weyl liquid, quasiparticles can be characterized by a quasiparticle spectral weight $Z$, although their lifetime increases much more rapidly as frequency approaches zero than in an ordinary Fermi liquid. The negative magnetoresistance still exists, even though the slope of the linear dependence of the DC conductivity with respect to the magnetic filed is decreased by the interaction. At elevated temperatures, a Weyl liquid crossesover to bad metallic behavior where the Drude peak becomes flat and featureless.
