Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB6(001)

Yoshiyuki Ohtsubo (), Toru Nakaya, Takuto Nakamura, Patrick Le Fèvre, François Bertran, Fumitoshi Iga and Shin-Ichi Kimura ()
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Yoshiyuki Ohtsubo: National Institutes for Quantum Science and Technology
Toru Nakaya: Osaka University
Takuto Nakamura: Osaka University
Patrick Le Fèvre: Synchrotron SOLEIL
François Bertran: Synchrotron SOLEIL
Fumitoshi Iga: Ibaraki University
Shin-Ichi Kimura: Osaka University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The topology and spin-orbital polarization of two-dimensional (2D) surface electronic states have been extensively studied in this decade. One major interest in them is their close relationship with the parities of the bulk (3D) electronic states. In this context, the surface is often regarded as a simple truncation of the bulk crystal. Here we show breakdown of the bulk-related in-plane rotation symmetry in the topological surface states (TSSs) of the Kondo insulator SmB6. Angle-resolved photoelectron spectroscopy (ARPES) performed on the vicinal SmB6(001)-p(2 × 2) surface showed that TSSs are anisotropic and that the Fermi contour lacks the fourfold rotation symmetry maintained in the bulk. This result emphasizes the important role of the surface atomic structure even in TSSs. Moreover, it suggests that the engineering of surface atomic structure could provide a new pathway to tailor various properties among TSSs, such as anisotropic surface conductivity, nesting of surface Fermi contours, or the number and position of van Hove singularities in 2D reciprocal space.

Date: 2022
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DOI: 10.1038/s41467-022-33347-0

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