Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
cond-mat.mtrl-sci
/ Authors
Bo Chen, Fucong Fei, Dongqin Zhang, Bo Zhang, Wanling Liu, Shuai Zhang, Pengdong Wang, Boyuan Wei, Yong Zhang, Zewen Zuo
and 16 more authors
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
/ 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.