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arXiv 1909.12409hep-thcond-mat.mes-hallcond-mat.str-elnucl-th
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广义旋量的拓扑与手征Anomaly

Topology of Generalized Spinors and Chiral Anomaly

Ho-Ung Yee, Piljin Yi

摘要:

具有非线性色散的外尔费米子已经出现在实际系统中,例如外尔半金属和拓扑绝缘体。我们考虑Dirac算子的最一般形式,并通过热核研究其在手征反常、指数定理和奇维配分函数中的拓扑性质。我们发现,所有这些拓扑量的增强由狄拉克算子在动量空间中定义的缠绕数,而不管时空维度。特别是$d=3+1$中的手征异常也通过常规的费曼图得到了证实。这些相互关联的结果使我们能够澄清Berry联络的手征反常和Chern数之间的关系,在最近的一些文献中有争议,也导致了Nielsen-Ninomiya定理的紧凑证明。

英文摘要:

Weyl fermions with nonlinear dispersion have appeared in real world systems, such as in the Weyl semi-metals and topological insulators. We consider the most general form of Dirac operators, and study its topological properties embedded in the chiral anomaly, in the index theorem, and in the odd-dimensional partition function, by employing the heat kernel. We find that all of these topological quantities are enhanced by a winding number defined by the Dirac operator in the momentum space, regardless of the spacetime dimensions. The chiral anomaly in $d=3+1$, in particular, is also confirmed via the conventional Feynman diagram. These interconnected results allow us to clarify the relationship between the chiral anomaly and the Chern number of the Berry connection, under dispute in some recent literatures, and also lead to a compact proof of the Nielsen-Ninomiya theorem.

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