Direct evidence of electron-hole compensation for extreme magnetoresistance in topologically trivial YBi
Direct evidence of electron-hole compensation for extreme magnetoresistance in topologically trivial YBi
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DOI：
10.1103/physrevb.103.115119
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发表时间：
2021-03
影响因子：
3.7
通讯作者：
S. Xiao;Yinxiang Li;Yong Li;Xiufu Yang;Shiju Zhang;Wei Liu;Xianxin Wu;Bin Li;M. Arita-M.-Ari
中科院分区：
文献类型：
--
作者：
S. Xiao;Yinxiang Li;Yong Li;Xiufu Yang;Shiju Zhang;Wei Liu;Xianxin Wu;Bin Li;M. Arita-M.-Ari
稀土磷属元素化合物拓扑态的预测已引起人们的新的兴趣。在几种稀土铌酸盐化合物中也观察到极强的磁电阻（XMR）。这些化合物中XMR的起源可以归因于几种机制，如拓扑非平凡的电子结构和电子空穴载流子平衡。YBi是一种具有XMR的典型稀土铌酸盐，具有非平凡的电子结构。在这项工作中，我们进行了直接调查的电子结构的YBi相结合的角度分辨光电子能谱和理论计算。我们的结果表明，在没有预期的能带反转的情况下，YBi在拓扑上是平凡的，并且他们排除了拓扑效应作为YBi中XMR的原因。此外，我们直接观察到几乎完美的电子-空穴补偿的电子结构中的YBi，这可能是主要的机制占XMR。
The prediction of topological states in rare-earth monopnictide compounds has attracted renewed interest. Extreme magnetoresistance (XMR) has also been observed in several nonmagnetic rare-earth monopnictide compounds. The origin of XMR in these compounds could be attributed to several mechanisms, such as topologically nontrivial electronic structures and electron-hole carrier balance. YBi is a typical rare-earth monopnictide exhibiting XMR and is expected to have a nontrivial electronic structure. In this work, we perform a direct investigation of the electronic structure of YBi by combining angle-resolved photoemission spectroscopy and theoretical calculations. Our results show that YBi is topologically trivial without the expected band inversion, and they rule out the topological effect as the cause of XMR in YBi. Furthermore, we directly observed nearly perfect electron-hole compensation in the electronic structure of YBi, which could be the primary mechanism accounting for the XMR.