Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$

Abstract

MnBi${}_8$Te${}_{13}$ 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 ($\mu$-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 Bi${}_2$Te${}_3$ quintuple layer directly above MnBi${}_2$Te${}_4$ 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 MnBi${}_8$Te${}_{13}$.

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• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Distinct magnetic gaps between antiferromagnetic and ferromagnetic orders driven by surface defects in the topological magnet MnBi2Te4
• Ultrafast time- and angle-resolved photoemission spectroscopy with widely tunable probe photon energy of 5.3-7.0 eV for investigating dynamics of three-dimensional materials
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
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• Three-Dirac-fermion approach to unexpected universal gapless surface states of van der Waals magnetic topological insulators
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• Axion insulators protected by C2T and their K-theory invariants and material realization
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• Defect-induced displacement of topological surface state in quantum magnet MnBi${}_2$Te${}_4$