Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals
Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals
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DOI：
10.1103/physrevb.96.155138
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发表时间：
2017-08
影响因子：
3.7
通讯作者：
E. V. Gorbar;V. A. Miransky;I. Shovkovy;P. Sukhachov
中科院分区：
文献类型：
--
作者：
E. V. Gorbar;V. A. Miransky;I. Shovkovy;P. Sukhachov
利用Kubo的线性响应理论，计算了具有破缺时间反演对称性的多Weyl半金属的一般晶格模型中的热电输运系数。系统地考虑了与Berry曲率引起的电磁轨道和热磁化的贡献。结果表明，热电输运的深刻影响的非平凡的拓扑结构的多Weyl半金属。特别是，计算揭示了一些热系数的拓扑起源描述的异常能斯特和热霍尔效应的情况下，背景磁场。与反常霍尔效应类似，所有反常热电系数都与Weyl节点的整数拓扑电荷成正比。研究了热电系数与化学势和温度的关系。
The thermoelectric transport coefficients are calculated in a generic lattice model of multi-Weyl semimetals with a broken time-reversal symmetry by using the Kubo's linear response theory. The contributions connected with the Berry curvature-induced electromagnetic orbital and heat magnetizations are systematically taken into account. It is shown that the thermoelectric transport is profoundly affected by the nontrivial topology of multi-Weyl semimetals. In particular, the calculation reveals a number of thermal coefficients of the topological origin which describe the anomalous Nernst and thermal Hall effects in the absence of background magnetic fields. Similarly to the anomalous Hall effect, all anomalous thermoelectric coefficients are proportional to the integer topological charge of the Weyl nodes. The dependence of the thermoelectric coefficients on the chemical potential and temperature is also studied.