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Non-trivial surface states of samarium hexaboride at the (111) surface

Author

Listed:
  • Yoshiyuki Ohtsubo

    (Osaka University
    Osaka University)

  • Yuki Yamashita

    (Osaka University)

  • Kenta Hagiwara

    (Osaka University)

  • Shin-ichiro Ideta

    (Institute for Molecular Science)

  • Kiyohisa Tanaka

    (Institute for Molecular Science)

  • Ryu Yukawa

    (High Energy Accelerator Research Organization (KEK))

  • Koji Horiba

    (High Energy Accelerator Research Organization (KEK))

  • Hiroshi Kumigashira

    (High Energy Accelerator Research Organization (KEK)
    Tohoku University)

  • Koji Miyamoto

    (Hiroshima University)

  • Taichi Okuda

    (Hiroshima University)

  • Wataru Hirano

    (Ibaraki University)

  • Fumitoshi Iga

    (Ibaraki University)

  • Shin-ichi Kimura

    (Osaka University
    Osaka University)

Abstract

The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB6), has stimulated considerable attention among those studying non-trivial electronic phenomena. However, experimental studies of these states have led to controversial conclusions mainly due to the difficulty and inhomogeneity of the SmB6 crystal surface. Here, we show the detailed electronic structure of SmB6 with angle-resolved photoelectron spectroscopy measurements of the three-fold (111) surface where only two inequivalent time-reversal-invariant momenta (TRIM) exist. We observe the metallic two-dimensional state was dispersed across the bulk Kondo gap. Its helical in-plane spin polarisation around the surface TRIM indicates that SmB6 is topologically non-trivial, according to the topological classification theory for weakly correlated systems. Based on these results, we propose a simple picture of the controversial topological classification of SmB6.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10353-3
    DOI: 10.1038/s41467-019-10353-3
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    Cited by:

    1. 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.

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