Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
复制标题
反铁磁拓扑绝缘体MnBi2Te4的拓扑电子结构及其温度演化
DOI：
10.1103/physrevx.9.041040
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发表时间：
2019-11-21
影响因子：
12.5
通讯作者：
Chen, Y. L.
中科院分区：
文献类型：
--
作者：
Chen, Y. J.;Xu, L. X.;Chen, Y. L.
内禀磁拓扑绝缘体具有丰富的拓扑效应，如量子反常霍尔效应和轴子电动力学等.在这里，我们结合同步辐射和激光光源的使用，对它进行了全面和高分辨率的角分辨光电子能谱研究，并清晰地确定了它的拓扑电子结构。与理论预测和以前的研究相比，我们观察到拓扑表面态与减少间隙形成一个特征狄拉克锥。我们认为，拓扑表面状态介导的不同磁化方向的多畴。此外，能带的温度演化清楚地揭示了它们与磁相变的相互作用，分别显示出体态和表面态之间有趣的差异。详细的电子结构及其温度演化的调查提供了重要的洞察不仅奇异的性质，而且在磁性拓扑量子材料的磁性和拓扑电子结构之间的相互作用的一般理解。
The intrinsic magnetic topological insulatorexhibits rich topological effects such as quantum anomalous Hall effect and axion electrodynamics. Here, by combining the use of synchrotron and laser light sources, we carry out comprehensive and high-resolution angle-resolved photoemission spectroscopy studies onand clearly identify its topological electronic structure. In contrast to theoretical predictions and previous studies, we observe topological surface states with diminished gap forming a characteristic Dirac cone. We argue that the topological surface states are mediated by multidomains of different magnetization orientations. In addition, the temperature evolution of the energy bands clearly reveals their interplay with the magnetic phase transition by showing interesting differences between the bulk and surface states, respectively. The investigation of the detailed electronic structure ofand its temperature evolution provides important insight into not only the exotic properties of, but also the generic understanding of the interplay between magnetism and topological electronic structure in magnetic topological quantum materials.