Anisotropic Gap Structure and Sign Reversal Symmetry in Monolayer Fe(Se,Te)

被引：3

作者：

Li, Yu ^{[1
]}

Shen, Dingyu ^{[1
]}

Kreisel, Andreas ^{[2
]}

Chen, Cheng ^{[1
]}

Wei, Tianheng ^{[1
]}

Xu, Xiaotong ^{[1
]}

Wang, Jian ^{[1
,3
,4
,5
]}

机构：

[1] Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China

[2] Univ Leipzig, Inst Theoret Phys, D-04103 Leipzig, Germany

[3] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[4] Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China

[5] Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China

来源：

NANO LETTERS | 2023年 / 23卷 / 01期

基金：

中国国家自然科学基金; 国家重点研发计划; 北京市自然科学基金;

关键词：

high-temperature superconductors; anisotropic superconducting gap; s?-wave pairing symmetry; quasiparticle interference; scanning tunneling spectroscopy; S-WAVE SUPERCONDUCTIVITY; TEMPERATURE; MODE;

D O I：

10.1021/acs.nanolett.2c03735

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The iron-based superconductors are an ideal platform to reveal the enigma of the unconventional superconductivity and potential topological superconductivity. Among them, the monolayer Fe(Se,Te)/SrTiO3(001), which is proposed to be topological nontrivial, shows interface-enhanced high-temperature superconductivity in the two-dimensional limit. However, the experimental studies on the superconducting pairing mechanism of monolayer Fe(Se,Te) films are still limited. Here, by measuring the quasiparticle interference in monolayer Fe(Se,Te)/SrTiO3(001), we report the observation of the anisotropic structure of the large superconducting gap and the sign change of the superconducting gap on different electron pockets. The results are well consistent with the "bonding-antibonding" s +/--wave pairing symmetry driven by spin fluctuations in conjunction with spin-orbit coupling. Our work is of basic significance not only for a unified superconducting formalism in the iron-based superconductors, but also for understanding of topological superconductivity in high-temperature superconductors.

引用

页码：140 / 147

页数：8

共 45 条

[21] Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO3 [J].

Huang, Dennis ;

Song, Can-Li ;

Webb, Tatiana A. ;

Fang, Shiang ;

Chang, Cui-Zu ;

Moodera, Jagadeesh S. ;

Kaxiras, Efthimios ;

Hoffman, Jennifer E. .

PHYSICAL REVIEW LETTERS, 2015, 115 (01)

[22] Superconductivity in FeSe Thin Films Driven by the Interplay between Nematic Fluctuations and Spin-Orbit Coupling [J].

Kang, Jian ;

Fernandes, Rafael M. .

PHYSICAL REVIEW LETTERS, 2016, 117 (21)

[23] Interpocket Pairing and Gap Symmetry in Fe-Based Superconductors with Only Electron Pockets [J].

Khodas, M. ;

Chubukov, A. V. .

PHYSICAL REVIEW LETTERS, 2012, 108 (24)

[24] Orbital selective pairing and gap structures of iron-based superconductors [J].

Kreisel, Andreas ;

Andersen, Brian M. ;

Sprau, P. O. ;

Kostin, A. ;

Davis, J. C. Seamus ;

Hirschfeld, P. J. .

PHYSICAL REVIEW B, 2017, 95 (17)

[25] Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx [J].

Kuroki, Kazuhiko ;

Onari, Seiichiro ;

Arita, Ryotaro ;

Usui, Hidetomo ;

Tanaka, Yukio ;

Kontani, Hiroshi ;

Aoki, Hideo .

PHYSICAL REVIEW LETTERS, 2008, 101 (08)

[26] Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3 [J].

Lee, J. J. ;

Schmitt, F. T. ;

Moore, R. G. ;

Johnston, S. ;

Cui, Y. -T. ;

Li, W. ;

Yi, M. ;

Liu, Z. K. ;

Hashimoto, M. ;

Zhang, Y. ;

Lu, D. H. ;

Devereaux, T. P. ;

Lee, D. -H. ;

Shen, Z. -X. .

NATURE, 2014, 515 (7526) :245-U207

[27] Interface-enhanced high-temperature superconductivity in single-unit-cell FeTe1-xSex films on SrTiO3 [J].

Li, Fangsen ;

Ding, Hao ;

Tang, Chenjia ;

Peng, Junping ;

Zhang, Qinghua ;

Zhang, Wenhao ;

Zhou, Guanyu ;

Zhang, Ding ;

Song, Can-Li ;

He, Ke ;

Ji, Shuaihua ;

Chen, Xi ;

Gu, Lin ;

Wang, Lili ;

Ma, Xu-Cun ;

Xue, Qi-Kun .

PHYSICAL REVIEW B, 2015, 91 (22)

[28] Orbital-Selective High-Temperature Cooper Pairing Developed inthe Two-Dimensional Limit [J].

Liu, Chaofei ;

Kreisel, Andreas ;

Zhong, Shan ;

Li, Yu ;

Andersen, Brian M. ;

Hirschfeld, Peter ;

Wang, Jian .

NANO LETTERS, 2022, 22 (08) :3245-3251

[29] Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states [J].

Liu, Chaofei ;

Wang, Jian .

2D MATERIALS, 2020, 7 (02)

[30] Spectroscopic Imaging of Quasiparticle Bound States Induced by Strong Nonmagnetic Scatterings in One-Unit-Cell FeSe/SrTiO3 [J].

Liu, Chaofei ;

Wang, Ziqiao ;

Gao, Yi ;

Liu, Xiaoqiang ;

Liu, Yi ;

Wang, Qiang-Hua ;

Wang, Jian .

PHYSICAL REVIEW LETTERS, 2019, 123 (03)

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