ARPES detection of superconducting gap sign in unconventional superconductors

Qiang Gao, Jin Mo Bok, Ping Ai, Jing Liu, Hongtao Yan, Xiangyu Luo, Yongqing Cai, Cong Li, Yang Wang, Chaohui Yin, Hao Chen, Genda Gu, Fengfeng Zhang, Feng Yang, Shenjin Zhang, Qinjun Peng, Zhihai Zhu, Guodong Liu, Zuyan Xu, Tao Xiang, Lin Zhao (), Han-Yong Choi () and X. J. Zhou ()
Additional contact information
Qiang Gao: Chinese Academy of Sciences
Jin Mo Bok: Pohang University of Science and Technology (POSTECH)
Ping Ai: Chinese Academy of Sciences
Jing Liu: Chinese Academy of Sciences
Hongtao Yan: Chinese Academy of Sciences
Xiangyu Luo: Chinese Academy of Sciences
Yongqing Cai: Chinese Academy of Sciences
Cong Li: Chinese Academy of Sciences
Yang Wang: Chinese Academy of Sciences
Chaohui Yin: Chinese Academy of Sciences
Hao Chen: Chinese Academy of Sciences
Genda Gu: Brookhaven National Laboratory
Fengfeng Zhang: Chinese Academy of Sciences
Feng Yang: Chinese Academy of Sciences
Shenjin Zhang: Chinese Academy of Sciences
Qinjun Peng: Chinese Academy of Sciences
Zhihai Zhu: Chinese Academy of Sciences
Guodong Liu: Chinese Academy of Sciences
Zuyan Xu: Chinese Academy of Sciences
Tao Xiang: Chinese Academy of Sciences
Lin Zhao: Chinese Academy of Sciences
Han-Yong Choi: SungKyunKwan University
X. J. Zhou: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The superconducting gap symmetry is crucial in understanding the underlying superconductivity mechanism. Angle-resolved photoemission spectroscopy (ARPES) has played a key role in determining the gap symmetry in unconventional superconductors. However, it has been considered so far that ARPES can only measure the magnitude of the superconducting gap but not its phase; the phase has to be detected by other phase-sensitive techniques. Here we propose a method to directly detect the superconducting gap sign by ARPES. This method is successfully validated in a cuprate superconductor Bi2Sr2CaCu2O8+δ with a well-known d-wave gap symmetry. When two bands have a strong interband interaction, the resulted electronic structures in the superconducting state are sensitive to the relative gap sign between the two bands. Our present work provides an approach to detect the gap sign and can be applied to various superconductors, particularly those with multiple orbitals like the iron-based superconductors.

Date: 2024
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DOI: 10.1038/s41467-024-48610-9

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