Journal Article

Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4

Li, J H, Cacho, C, Liang, A J, Yang, L X, Chen, Y J, Wang, H Y, Liu, S, Chen, Y L, Jung, S W, Mao, Y H, Wang, M X, Y. Wu, Y. Xu, Liu, Z K, Xu, L X, Zhang, C F, Guo, Y F, Chen, C, H. Li, Li, Y W

2019

Overview

The intrinsic magnetic topological insulatorMnBi2Te4exhibits 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 onMnBi2Te4and 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 ofMnBi2Te4and its temperature evolution provides important insight into not only the exotic properties ofMnBi2Te4, but also the generic understanding of the interplay between magnetism and topological electronic structure in magnetic topological quantum materials.

• Publisher: American Physical Society
• Subject: Antiferromagnetism / Electrodynamics / Electromagnetism / Electronic structure / Energy bands / Energy gap / Evolution / First principles / Light sources / Magnetic properties / Magnetism / Phase transitions / Photoelectric emission / Photoelectron spectroscopy / Quantum Hall effect / Spectrum analysis / Synchrotrons / Topological insulators