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Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission

Author

Listed:
  • J. Jiang

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • S. Li

    (Nanjing University)

  • T. Zhang

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • Z. Sun

    (University of Science and Technology of China
    National Synchrotron Radiation Laboratory, University of Science and Technology of China)

  • F. Chen

    (Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China)

  • Z.R. Ye

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • M. Xu

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • Q.Q. Ge

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • S.Y. Tan

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • X.H. Niu

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • M. Xia

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • B.P. Xie

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

  • Y.F. Li

    (Nanjing University)

  • X.H. Chen

    (University of Science and Technology of China
    Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China)

  • H.H. Wen

    (Nanjing University)

  • D.L. Feng

    (State Key Laboratory of Surface Physics, and Advanced Materials Laboratory, Fudan University)

Abstract

SmB6, a well-known Kondo insulator, exhibits a transport anomaly at low temperature. This anomaly is usually attributed to states within the hybridization gap. Recent theoretical work and transport measurements suggest that these in-gap states could be ascribed to topological surface states, which would make SmB6 the first realization of topological Kondo insulator. Here by performing angle-resolved photoemission spectroscopy experiments, we directly observe several dispersive states within the hybridization gap of SmB6. These states show negligible kz dependence, which indicates their surface origin. Furthermore, we perform photoemission circular dichroism experiments, which suggest that the in-gap states possess chirality of the orbital angular momentum. These states vanish simultaneously with the hybridization gap at around 150 K. Together, these observations suggest the possible topological origin of the in-gap states.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms4010
    DOI: 10.1038/ncomms4010
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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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