# Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes **Authors:** Bo Chen, Fucong Fei, Dongqin Zhang, Bo Zhang, Wanling Liu, Shuai, Zhang, Pengdong Wang, Boyuan Wei, Yong Zhang, Zewen Zuo, Jingwen Guo,, Qianqian Liu, Zilu Wang, Xuchuan Wu, Junyu Zong, Xuedong Xie, Wang Chen, Zhe, Sun, Shancai Wang, Yi Zhang, Minhao Zhang, Xuefeng Wang, Fengqi Song, Haijun, Zhang, Dawei Shen, Baigeng Wang arXiv: 1903.09934 ยท 2019-10-10 ## TL;DR This paper reports the discovery of intrinsic magnetic topological insulator phases in Sb-doped MnBi2Te4, demonstrating potential for high-temperature quantum anomalous Hall effects and advancing the understanding of topological magnetic materials. ## Contribution It introduces a new family of Mn(SbxBi(1-x))2Te4 materials with intrinsic MTI phases, combining experimental growth, spectroscopy, transport measurements, and first-principles calculations. ## Key findings - Existence of an optimized MTI zone in the phase diagram. - Potential for high-temperature quantum anomalous Hall phase. - Identification of promising materials for device applications. ## Abstract Magnetic topological insulators (MTIs) offer a combination of topologically nontrivial characteristics and magnetic order and show promise in terms of potentially interesting physical phenomena such as the quantum anomalous Hall (QAH) effect and topological axion insulating states. However, the understanding of their properties and potential applications have been limited due to a lack of suitable candidates for MTIs. Here, we grow two-dimensional single crystals of Mn(SbxBi(1-x))2Te4 bulk and exfoliate them into thin flakes in order to search for intrinsic MTIs. We perform angle-resolved photoemission spectroscopy, low-temperature transport measurements, and first-principles calculations to investigate the band structure, transport properties, and magnetism of this family of materials, as well as the evolution of their topological properties. We find that there exists an optimized MTI zone in the Mn(SbxBi(1-x))2Te4 phase diagram, which could possibly host a high-temperature QAH phase, offering a promising avenue for new device applications. --- Source: https://tomesphere.com/paper/1903.09934