Surface Kondo effect and non-trivial metallic state of the Kondo insulator YbB12

Kenta Hagiwara, Yoshiyuki Ohtsubo (), Masaharu Matsunami, Shin-ichiro Ideta, Kiyohisa Tanaka, Hidetoshi Miyazaki, Julien E. Rault, Patrick Le Fèvre, François Bertran, Amina Taleb-Ibrahimi, Ryu Yukawa, Masaki Kobayashi, Koji Horiba, Hiroshi Kumigashira, Kazuki Sumida, Taichi Okuda, Fumitoshi Iga and Shin-ichi Kimura ()
Additional contact information
Kenta Hagiwara: Graduate School of Science, Osaka University
Yoshiyuki Ohtsubo: Graduate School of Science, Osaka University
Masaharu Matsunami: UVSOR Facility, Institute for Molecular Science
Shin-ichiro Ideta: UVSOR Facility, Institute for Molecular Science
Kiyohisa Tanaka: UVSOR Facility, Institute for Molecular Science
Hidetoshi Miyazaki: UVSOR Facility, Institute for Molecular Science
Julien E. Rault: Synchrotron SOLEIL
Patrick Le Fèvre: Synchrotron SOLEIL
François Bertran: Synchrotron SOLEIL
Amina Taleb-Ibrahimi: Synchrotron SOLEIL
Ryu Yukawa: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Masaki Kobayashi: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Koji Horiba: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Hiroshi Kumigashira: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Kazuki Sumida: Graduate School of Science, Hiroshima University
Taichi Okuda: HiSOR, Hiroshima University
Fumitoshi Iga: College of Science, Ibaraki University
Shin-ichi Kimura: Graduate School of Science, Osaka University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract A synergistic effect between strong electron correlation and spin–orbit interaction has been theoretically predicted to realize new topological states of quantum matter on Kondo insulators (KIs), so-called topological Kondo insulators (TKIs). One TKI candidate has been experimentally observed on the KI SmB6(001), and the origin of the surface states (SS) and the topological order of SmB6 has been actively discussed. Here, we show a metallic SS on the clean surface of another TKI candidate YbB12(001) using angle-resolved photoelectron spectroscopy. The SS shows temperature-dependent reconstruction corresponding to the Kondo effect observed for bulk states. Despite the low-temperature insulating bulk, the reconstructed SS with c–f hybridization is metallic, forming a closed Fermi contour surrounding on the surface Brillouin zone and agreeing with the theoretically expected behaviour for SS on TKIs. These results demonstrate the temperature-dependent holistic reconstruction of two-dimensional states localized on KIs surface driven by the Kondo effect.

Date: 2016
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DOI: 10.1038/ncomms12690

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