论文标题
在拓扑琐碎的YBI中对XMR的电子孔补偿的直接证据
Direct evidence of electron-hole compensation for XMR in topologically trivial YBi
论文作者
论文摘要
在稀土单斑层化合物中对拓扑状态的预测引起了人们的新兴趣。在几种非磁性稀土单核化合物中也观察到了极端磁阻（XMR）。这些化合物中XMR的起源可以归因于几种机制，例如拓扑非平凡的电子结构和电子孔载体平衡。 YBI是一种典型的稀土单核，表现为XMR，预计将具有非平凡的电子结构。在这项工作中，我们通过结合角度分辨光发射光谱和理论计算来直接研究YBI的电子结构。我们的结果表明，YBI在拓扑上是微不足道的，而没有预期的频带倒置，它们排除了拓扑作用是YBI中XMR的原因。此外，我们直接观察到YBI的电子结构中的完美电子孔补偿，这可能是XMR的主要机制。
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 expected to have a nontrivial electronic structure. In this work, we performed 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 perfect electron-hole compensation in the electronic structure of YBi, which could be the primary mechanism accounting for the XMR.
