Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi<sub>8</sub>Te<sub>13</sub>.

Zhong, Haoyuan; Bao, Changhua; Wang, Huan; Li, Jiaheng; Yin, Zichen; Xu, Yong; Duan, Wenhui; Xia, Tian-Long; Zhou, Shuyun

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

Zhong, Haoyuan; Bao, Changhua; Wang, Huan; Li, Jiaheng; Yin, Zichen; Xu, Yong; Duan, Wenhui; Xia, Tian-Long; Zhou, Shuyun.

Affiliation

Zhong H; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Bao C; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Wang H; Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, P. R. China.
Li J; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Yin Z; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Xu Y; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Duan W; Frontier Science Center for Quantum Information, Beijing 100084, P. R. China.
Xia TL; State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, P. R. China.
Zhou S; Frontier Science Center for Quantum Information, Beijing 100084, P. R. China.

Nano Lett ; 21(14): 6080-6086, 2021 Jul 28.

Article in En | MEDLINE | ID: mdl-34242038

ABSTRACT

ABSTRACT

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

Key words

hybridization gap; light-tunable interlayer interaction; magnetic topological insulator, MnBi8Te13; µ-TrARPES

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