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

Wei, Zhongxu1,2; Qin, Shengshan3,4,5; Ding, Cui2,6; Wu, Xianxin7; Hu, Jiangping4,5,8,9; Sun, Yu-Jie1,10; Wang, Lili2; Xue, Qi-Kun1,2,6,10

2023-08-31

10.1038/s41467-023-40931-5

NATURE COMMUNICATIONS   Impact Factor & Quartile

2041-1723

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.

SCI

English

NI Journal Papers

First ; Corresponding

This work is supported by the National Natural Science Foundation of China (Grants No. 12074210, 52388201, 12141402, 11790311 and No. 12204222) and the National Basic Research Program of China (Grant No. 2017YFA0303303).["52388201","12141402","11790311","12204222","2017YFA0303303"] ; null[12074210]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001059079200003

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1.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
2.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
3.Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China
4.Univ Chinese Acad Sci, Kavli Inst Theoret Sci, Beijing 100049, Peoples R China
5.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100049, Peoples R China
6.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
7.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
8.Chinese Acad Sci, Beijing Natl Res Ctr Condensed Matter Phys, Beijing 100190, Peoples R China
9.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
10.Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Macao Greater Bay Area, Hong Kong 518045, Peoples R China

Wei, Zhongxu,Qin, Shengshan,Ding, Cui,et al. Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states[J]. NATURE COMMUNICATIONS,2023,14(1).

Wei, Zhongxu.,Qin, Shengshan.,Ding, Cui.,Wu, Xianxin.,Hu, Jiangping.,...&Xue, Qi-Kun.(2023).Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states.NATURE COMMUNICATIONS,14(1).

Wei, Zhongxu,et al."Identifying s-wave pairing symmetry in single-layer FeSe from topologically trivial edge states".NATURE COMMUNICATIONS 14.1(2023).