摘要
An intrinsic magnetic topological insulator(TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi2Te4, by alternate growth of a Bi2Te3 quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.
An intrinsic magnetic topological insulator（TI） is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi2Te4, by alternate growth of a Bi2Te3 quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.
作者
龚演
郭景文
李佳恒
朱科静
廖孟涵
刘效治
张庆华
谷林
唐林
冯硝
张定
李渭
宋灿立
王立莉
于浦
陈曦
王亚愚
姚宏
段文晖
徐勇
张首晟
马旭村
薛其坤
何珂
Yan Gong;Jingwen Guo;Jiaheng Li;Kejing Zhu;Menghan Liao;Xiaozhi Liu;Qinghua Zhang;Lin Gu;Lin Tang;Xiao Feng;Ding Zhang;Wei Li;Canli Song;Lili Wang;Pu Yu;Xi Chen;Yayu Wang;Hong Yao;Wenhui Duan;Yong Xu;Shou-Cheng Zhang;Xucun Ma;Qi-Kun Xue;Ke He
基金
Supported by the Ministry of Science and Technology of China
the National Science Foundation of China
the Beijing Advanced Innovation Center for Future Chip(ICFC)
