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

Zhongxu Wei, Shengshan Qin, Cui Ding, Xianxin Wu, Jiangping Hu, Yu-Jie Sun (), Lili Wang () and Qi-Kun Xue ()
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Zhongxu Wei: Southern University of Science and Technology
Shengshan Qin: Beijing Institute of Technology
Cui Ding: Tsinghua University
Xianxin Wu: Chinese Academy of Sciences
Jiangping Hu: University of Chinese Academy of Sciences
Yu-Jie Sun: Southern University of Science and Technology
Lili Wang: Tsinghua University
Qi-Kun Xue: Southern University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40931-5

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