Thermoelectric transport and phonon drag in Weyl semimetal monochalcogenides
Thermoelectric transport and phonon drag in Weyl semimetal monochalcogenides
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外尔半金属单硫属化物中的热电输运和声子拖曳
DOI：
10.1103/physrevb.104.115164
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发表时间：
2021
影响因子：
3.7
通讯作者：
Jia Shuang
中科院分区：
文献类型：
--
作者：
Xu Xitong;Liu Yiyuan;Seyfarth Gabriel;Pourret Alex;re;Ma Wenlong;Zhou Huibin;Wang Guangqiang;Qu Zhe;Jia Shuang
热电输运中的拓扑效应是半金属研究的一个重要方面，但在有限外场中双拓扑半金属中是否存在反常能斯特效应仍存在争议。为了说明如何识别拓扑半金属中的拓扑效应，我们对四种Weyl半金属：TaAs，TaP，NbAs和NbP的磁热电性质进行了全面的研究。我们观察到大的磁Seebeck和能斯特信号在中间温度下，这是由于一个多频带的普通贡献和非弹性，声子拖曳效应，而后者被忽略在以前的研究。这种声子拖曳效应也会导致热电输运信号中量子振荡的不寻常的、突出的温度和场依赖性。另一方面，只有一个相对较小的异常热电效应的签名被发现在砷化钽相比，普通的效果。
The topological effect in thermoelectric transport is an important research aspect in semimetals, but whether an anomalous Nernst effect exists in nonmagnetic topological semimetals in a finite external field is still under debate. To demonstrate how to discern the topological effect in nonmagnetic topological semimetals, we present a comprehensive study on the magnetothermoelectric properties for four Weyl semimetals: TaAs, TaP, NbAs, and NbP. We observe large magneto-Seebeck and Nernst signals at intermediate temperatures, which are attributed to a multiband ordinary contribution and an inelastic, phonon-drag effect, while the latter is ignored in previous studies. This phonon-drag effect also induces an unusual, prominent temperature and field dependence of quantum oscillations in thermoelectric transport signals. On the other hand, only signatures of a relatively small anomalous thermoelectric effect are found in TaAs compared with the ordinary effect.