Termination-dependent Surface In-gap States in a Mixed-valent Topological Insulator: SmB${}_6$

Abstract

We have investigated the surface states of a potential mixed-valent topological insulator SmB${}_6$ based on the first principles density functional theory slab band structure analysis. We have found that metallic surface states are formed in the bulk band gap region, providing evidence for the topological insulating nature of SmB${}_6$. The obtained surface in-gap states are quite different from those in existing reports in that they are formed differently depending on the Sm or B${}_6$ surface termination, and are composed of mainly Sm $4f$ state indicating the essentiality of including $f$ electrons in describing the surface states. We have obtained the spin chiral structures of the Fermi surfaces, which are also in accordance with the topological insulating nature of SmB${}_6$.

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• Band symmetries of mixed-valence topological insulator: SmB6
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• Surface and electronic structure of SmB${}_6$ through Scanning Tunneling Microscopy
• Observation of a well-defined hybridization gap and in-gap states on the SmB6 (001) surface
• Chemical and valence reconstruction at the surface of SmB6 revealed with resonant soft x-ray reflectometry
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
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• Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
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• Planar tunneling spectroscopy of the topological Kondo insulator SmB${}_6$
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• Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments
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• Global perspectives of the bulk electronic structure of URu${}_2$Si${}_2$ from angle-resolved photoemission
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Comparative Scanning Tunneling Microscopy Study on Hexaborides
• Topological nature of the Kondo insulator SmB${}_6$ and its sensitiveness to Sm vacancy
• ${\mathcal{Z}}_2$ classification for a novel antiferromagnetic topological insulating phase in three-dimensional topological Kondo insulator
• Surface reconstruction in a tight-binding model for the topological Kondo insulator SmB6
• Valence transition in topological Kondo insulator