Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi8Te13

• DOI: 10.1021/acs.nanolett.1c01448
• Publication Date: 2021-07-09T16:21:35Z
• Authors: Haoyuan Zhong; Changhua Bao; Huan Wang; Jiaheng Li; Zichen Yin; Yong Xu; Wenhui Duan; Tian-Long Xia; Shuyun Zhou
• Keywords: Photoexcitation; Topological insulator; Surface States

MnBi8Te13 is an intrinsic ferromagnetic (FM) topological insulator with different complex surface terminations. Resolving the electronic structures of termination surfaces and manipulation state are important. Here, by using micrometer spot time- angle-resolved photoemission spectroscopy (μ-TrARPES), we resolve reveal ultrafast dynamics upon photoexcitation. Photoinduced filling hybridization gap observed for Bi2Te3 quintuple layer directly above MnBi2Te4 accompanied a nontrivial shift state, suggesting light-tunable interlayer interaction. Relaxation photoexcited electrons holes within 1–2 ps. Our work reveals photoexcitation as potential control knob tailoring interaction MnBi8Te13.