Dirac和Weyl半金属热电输运的共形反常指纹：Kubo公式的结果
Fingerprints of the conformal anomaly on the thermoelectric transport in Dirac and Weyl semimetals: Result from a Kubo formula
摘要：
在最近的一项工作中，共形反常对狄拉克或外尔半金属能斯特流的贡献被报道。在零温度和零化学势条件下，输运系数为非零，这是由真空贡献引起的。本文用Kubo公式计算了热电系数，并证实了在零温度和零化学势的限制下，计算结果与量子场论的估计一致。对于有限化学势μ，在μ = 0附近，横向塞贝克系数显示出一个平台，表明只有零共形朗道能级对这种本征效应有贡献。这一结果为实验观察比标准手征反常难得多的几何反常开辟了道路。
英文摘要：
In a recent work, a contribution to the Nernst current of a Dirac or Weyl semimetal coming from the conformal anomaly was reported. Being originated from an anomaly - a vacuum contribution -, a non-zero transport coefficient was predicted at zero temperature and chemical potential. In this work we perform a Kubo formula calculation of the thermoelectrical coefficient and confirm that the result agrees with the quantum field theory estimation in the limit of zero temperature and chemical potential. For finite chemical potential μ around μ = 0 the transverse Seebeck coefficient shows a plateau indicating that only the zero conformal Landau levels contributes to this intrinsic effect. This result opens the way to the experimental observation of a geometric anomaly which is much harder to explore than the standard chiral anomaly.
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