论文标题
伪传输中的异常运输
Anomalous transport in pseudospin-1 fermions
论文作者
论文摘要
在半经典的Boltzmann近似中研究了$α-\ Mathcal {t} _3 $具有有限间隙的伪s-1 fermions模型的电子传输。我们表明，轨道磁矩与外部磁场的耦合，否则在无质量模型中不存在，破坏山谷对称性，对纵向和霍尔电导率进行有限且可测量的校正，并产生由于浆果曲率而引起的异常霍尔电导率。我们还表明，轨道磁矩诱导的磁势可以是正的或负的。该符号取决于障碍的数量，并且对于磁势的常规和异常贡献都不同。最近的材料进步和即将实现的冷原子实验可能意识到伪-1 fermions使我们的研究及时且适当。
Electronic transport in the $α-\mathcal{T}_3$ model of pseudospin-1 fermions with a finite gap is studied within the semiclassical Boltzmann approximation. We show that coupling of the orbital magnetic moment to the external magnetic field, which is otherwise absent in the massless model, breaks valley symmetry, results in finite and measurable corrections to the longitudinal and Hall conductivity, and yields anomalous Hall conductivity due to the Berry curvature. We also show that, remarkably, magnetoresistance induced by the orbital magnetic moment can be either positive or negative; the sign depends on the amount of disorder, and is different for both conventional and anomalous contributions to the magnetoresistance. Recent material advances and upcoming experiments on cold atoms that may realize pseudospin-1 fermions makes our study timely and appropriate.
