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

Author

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  • Yoshiyuki Ohtsubo

    (National Institutes for Quantum Science and Technology
    Osaka University
    Osaka University)

  • Toru Nakaya

    (Osaka University)

  • Takuto Nakamura

    (Osaka University
    Osaka University)

  • Patrick Le Fèvre

    (Synchrotron SOLEIL)

  • François Bertran

    (Synchrotron SOLEIL)

  • Fumitoshi Iga

    (Ibaraki University)

  • Shin-Ichi Kimura

    (Osaka University
    Osaka University
    Institute for Molecular Science)

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.

Suggested Citation

  • Yoshiyuki Ohtsubo & Toru Nakaya & Takuto Nakamura & Patrick Le Fèvre & François Bertran & Fumitoshi Iga & Shin-Ichi Kimura, 2022. "Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB6(001)," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33347-0
    DOI: 10.1038/s41467-022-33347-0
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    as
    1. J. Jiang & S. Li & T. Zhang & Z. Sun & F. Chen & Z.R. Ye & M. Xu & Q.Q. Ge & S.Y. Tan & X.H. Niu & M. Xia & B.P. Xie & Y.F. Li & X.H. Chen & H.H. Wen & D.L. Feng, 2013. "Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
    2. Yoshiyuki Ohtsubo & Yuki Yamashita & Kenta Hagiwara & Shin-ichiro Ideta & Kiyohisa Tanaka & Ryu Yukawa & Koji Horiba & Hiroshi Kumigashira & Koji Miyamoto & Taichi Okuda & Wataru Hirano & Fumitoshi Ig, 2019. "Non-trivial surface states of samarium hexaboride at the (111) surface," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    3. P. Hlawenka & K. Siemensmeyer & E. Weschke & A. Varykhalov & J. Sánchez-Barriga & N. Y. Shitsevalova & A. V. Dukhnenko & V. B. Filipov & S. Gabáni & K. Flachbart & O. Rader & E. D. L. Rienks, 2018. "Samarium hexaboride is a trivial surface conductor," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    4. Koichiro Yaji & Kenta Kuroda & Sogen Toyohisa & Ayumi Harasawa & Yukiaki Ishida & Shuntaro Watanabe & Chuangtian Chen & Katsuyoshi Kobayashi & Fumio Komori & Shik Shin, 2017. "Spin-dependent quantum interference in photoemission process from spin-orbit coupled states," Nature Communications, Nature, vol. 8(1), pages 1-6, April.
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