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Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states

Author

Listed:
  • Zhongxu Wei

    (Southern University of Science and Technology
    Tsinghua University)

  • Shengshan Qin

    (Beijing Institute of Technology
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Cui Ding

    (Tsinghua University
    Beijing Academy of Quantum Information Sciences)

  • Xianxin Wu

    (Chinese Academy of Sciences)

  • Jiangping Hu

    (University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Yu-Jie Sun

    (Southern University of Science and Technology
    Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area (Guangdong))

  • Lili Wang

    (Tsinghua University)

  • Qi-Kun Xue

    (Southern University of Science and Technology
    Tsinghua University
    Beijing Academy of Quantum Information Sciences
    Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area (Guangdong))

Abstract

Determining the pairing symmetry of single-layer FeSe on SrTiO3 is the key to understanding the enhanced pairing mechanism. It also guides the search for superconductors with high transition temperatures. Despite considerable efforts, it remains controversial whether the symmetry is the sign-preserving s- or the sign-changing s±-wave. Here, we investigate the pairing symmetry of single-layer FeSe from a topological point of view. Using low-temperature scanning tunneling microscopy/spectroscopy, we systematically characterize the superconducting states at edges and corners of single-layer FeSe. The tunneling spectra collected at edges and corners show a full energy gap and a substantial dip, respectively, suggesting the absence of topologically non-trivial edge and corner modes. According to our theoretical calculations, these spectroscopic features can be considered as strong evidence for the sign-preserving s-wave pairing in single-layer FeSe.

Suggested Citation

  • Zhongxu Wei & Shengshan Qin & Cui Ding & Xianxin Wu & Jiangping Hu & Yu-Jie Sun & Lili Wang & Qi-Kun Xue, 2023. "Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40931-5
    DOI: 10.1038/s41467-023-40931-5
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    References listed on IDEAS

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    1. Zengyi Du & Xiong Yang & Hai Lin & Delong Fang & Guan Du & Jie Xing & Huan Yang & Xiyu Zhu & Hai-Hu Wen, 2016. "Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1−xFex)OHFeSe," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
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