拓扑平凡YBi中XMR电子空穴补偿的直接证据
Direct evidence of electron-hole compensation for XMR in topologically trivial YBi
摘要：
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了极强的磁电阻效应。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是一种典型的具有XMR的稀土铌酸盐，并且预期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的角度分辨光电子能谱和理论计算相结合。我们的结果表明，YBi是拓扑平凡的没有预期的带反转，他们排除了拓扑效应的原因XMR在YBi。此外，我们直接观察到完美的电子-空穴补偿的电子结构中的YBi，这可能是主要的机制占XMR。
英文摘要：
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.
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