论文标题
在倾斜的Weyl Fermions的晶格模型中，纵向磁电和平面厅效应
Longitudinal magnetoconductance and the planar Hall effect in a lattice model of tilted Weyl fermions
论文作者
论文摘要
Weyl半法中手性异常的实验验证是现代冷凝物理学中的一个活跃研究领域，通常依赖于纵向磁磁性（LMC）以及Planar Hall效应（PHE）的综合特征。最近已经显示，对于弱的非量化磁场，足够强的有限间隔散射驱动系统将LMC的迹象从正极切换到负面。在这里，我们揭示了另一个产生相同效果的独立来源。具体而言，线性色散的平滑晶格切断，在实际Weyl材料中无处不在，它在问题中引入了非线性，并且即使在消失的间隔散射的极限中，也可以驱动系统对非固定电气和磁场表现出负LMC。我们对玻璃体近似内倾斜的韦尔植物的晶格模型进行了纵向磁性的纵向磁性和平面霍尔效应。我们独立研究有限的晶格截止和倾斜参数的影响，并在相关参数空间中构造相图，这些空间与诊断真实Weyl材料中的手性异常相关。
The experimental verification of chiral anomaly in Weyl semimetals is an active area of investigation in modern condensed matter physics, which typically relies on the combined signatures of longitudinal magnetoconductance (LMC) along with the planar Hall effect (PHE). It has recently been shown that for weak non-quantizing magnetic fields, a sufficiently strong finite intervalley scattering drives the system to switch the sign of LMC from positive to negative. Here we unravel another independent source that produces the same effect. Specifically, a smooth lattice cutoff to the linear dispersion, which is ubiquitous in real Weyl materials, introduces nonlinearity in the problem and also drives the system to exhibit negative LMC for non-collinear electric and magnetic fields even in the limit of vanishing intervalley scattering. We examine longitudinal magnetoconductivity and the planar Hall effect semi-analytically for a lattice model of tilted Weyl fermions within the Boltzmann approximation. We independently study the effects of a finite lattice cutoff and tilt parameters and construct phase diagrams in relevant parameter spaces that are relevant for diagnosing chiral anomaly in real Weyl materials.
