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Spectroscopic signature of obstructed surface states in SrIn2P2

Author

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  • Xiang-Rui Liu

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

  • Hanbin Deng

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

  • Yuntian Liu

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

  • Zhouyi Yin

    (Southern University of Science and Technology (SUSTech))

  • Congrun Chen

    (Southern University of Science and Technology (SUSTech))

  • Yu-Peng Zhu

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

  • Yichen Yang

    (Chinese Academy of Sciences)

  • Zhicheng Jiang

    (Chinese Academy of Sciences)

  • Zhengtai Liu

    (Chinese Academy of Sciences)

  • Mao Ye

    (Chinese Academy of Sciences)

  • Dawei Shen

    (Chinese Academy of Sciences)

  • Jia-Xin Yin

    (Princeton University)

  • Kedong Wang

    (Southern University of Science and Technology (SUSTech))

  • Qihang Liu

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy
    Southern University of Science and Technology)

  • Yue Zhao

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

  • Chang Liu

    (Southern University of Science and Technology (SUSTech)
    International Quantum Academy)

Abstract

The century-long development of surface sciences has witnessed the discoveries of a variety of quantum states. In the recently proposed “obstructed atomic insulators”, symmetric charges are pinned at virtual sites where no real atoms reside. The cleavage through these sites could lead to a set of obstructed surface states with partial electronic occupation. Here, utilizing scanning tunneling microscopy, angle-resolved photoemission spectroscopy and first-principles calculations, we observe spectroscopic signature of obstructed surface states in SrIn2P2. We find that a pair of surface states that are originated from the pristine obstructed surface states split in energy by a unique surface reconstruction. The upper branch is marked with a striking differential conductance peak followed by negative differential conductance, signaling its localized nature, while the lower branch is found to be highly dispersive. This pair of surface states is in consistency with our calculational results. Our finding not only demonstrates a surface quantum state induced by a new type of bulk-boundary correspondence, but also provides a platform for exploring efficient catalysts and related surface engineering.

Suggested Citation

  • Xiang-Rui Liu & Hanbin Deng & Yuntian Liu & Zhouyi Yin & Congrun Chen & Yu-Peng Zhu & Yichen Yang & Zhicheng Jiang & Zhengtai Liu & Mao Ye & Dawei Shen & Jia-Xin Yin & Kedong Wang & Qihang Liu & Yue Z, 2023. "Spectroscopic signature of obstructed surface states in SrIn2P2," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38589-0
    DOI: 10.1038/s41467-023-38589-0
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    References listed on IDEAS

    as
    1. Kimoon Lee & Sung Wng Kim & Yoshitake Toda & Satoru Matsuishi & Hideo Hosono, 2013. "Dicalcium nitride as a two-dimensional electride with an anionic electron layer," Nature, Nature, vol. 494(7437), pages 336-340, February.
    2. A. K. Geim & I. V. Grigorieva, 2013. "Van der Waals heterostructures," Nature, Nature, vol. 499(7459), pages 419-425, July.
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