Laser ARPES on Pairing Symmetry and High-Tc Origin in High Temperature Superconductors

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Laser ARPES on Pairing Symmetry and High-Tc Origin in High Temperature Superconductors

XJZhou | Last updated on 01.09.2025

Section: (M) Fundamentals of high temperature superconductivity (mechanisms, pairing symmetry, etc);

Report type: Oral

Authors: Xingjiang Zhou

Affiliations: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Short Abstract (up to 700 symbols): brief outline of the main idea of the work: Using laser ARPES to study high temperature superconductors, we gained new insights on pairing symmetry and superconductivity mechanism of these superconductors.

We will report our recent progress in studying high temperature superconductors by laser-based angle-resolved photoemission spectroscopy (ARPES). A new approach is developed to make ARPES able to measure not only the superconducting gap size but also the gap sign [1]. The pairing symmetry is determined to be of the nodal s+-(G-M) form in the iron-based superconductor KFe₂As₂ which has only hole pockets [2]. Ubiquitous coexisting electron coupling with 70meV and 40meV modes is observed in cuprate superconductors [3]. The electronic origin of high-Tc maximization in trilayer cuprate superconductors is revealed [4]. We found orbital-dependent electron correlations in La₃Ni₂O₇ [5]. These results provide key insights in understanding superconductivity mechanism and also pave a way to further enhance Tc in these high temperature superconductors.

[1]. Qiang Gao, L. Zhao, X. J. Zhou et al., Nature Communications 15, 4538 (2024).

[2]. Dingsong Wu, Lin Zhao, X. J. Zhou et al., Nature Physics 20, 571 (2024).

[3]. Hongtao Yan, X. J. Zhou et al., PNAS 120, e2219491120 (2023).

[4]. Xiangyu Luo, X. J. Zhou et al., Nature Physics 19, 1841 (2023).

[5]. Jiangang Yang, L. Zhao, X. J. Zhou et al., Nature Communications 15, 4373 (2024).