论文标题
非中心对称浆果曲率诱导的拓扑线性磁倍率和热导性
Topological linear magnetoresistivity and thermoconductivity induced by noncentrosymmetric Berry curvature
论文作者
论文摘要
浆果曲率在拓扑材料的磁运输中起关键作用。然而，尚不清楚浆果曲率是否会产生特定缩放行为的普遍运输现象。在这项工作中，基于半经典的玻尔兹曼形式主义和对称分析，我们表明，浆果曲率的非中心对称分布通常会导致线性磁磁性和热导性表现出B量表的行为。然后，我们研究了2D MNBI2TE4薄片和3D自旋轨道偶联电子气体中的这种拓扑线性磁倍率，前者与实验观察结果非常吻合。我们的机制和常规各向异性磁阻的差异是阐明的。我们的理论提出了拓扑线性磁化和热导性的普遍场景，并预测了各种材料中发生的这种效果，这也为最近观察到的线性磁倍率观察提供了合理的解释。
The Berry curvature plays a key role in the magnetic transport of topological materials. Yet, it is not clear whether the Berry curvature by itself can give rise to universal transport phenomena with specific scaling behaviors. In this work, based on the semiclassical Boltzmann formalism and the symmetry analysis, we show that the noncentrosymmetric distribution of the Berry curvature generally results in linear magnetoresistivity and thermoconductivity both exhibiting the B-scaling behavior. We then study such kind of topological linear magnetoresistivity in the 2D MnBi2Te4 flakes and the 3D spin-orbit-coupled electron gas, the former showing good agreement with the experimental observations. The difference between our mechanism and the conventional anisotropic magnetoresistance is elucidated. Our theory proposes a universal scenario for the topological linear magnetoresistivity and thermoconductivity and predicts such effects to occur in various materials, which also provides a reasonable explanation for the recent observations of linear magnetoresistivity.
