A topological Hund nodal line antiferromagnet

Xian P. Yang (), Yueh-Ting Yao, Pengyu Zheng, Shuyue Guan, Huibin Zhou, Tyler A. Cochran, Che-Min Lin, Jia-Xin Yin, Xiaoting Zhou, Zi-Jia Cheng, Zhaohu Li, Tong Shi, Md Shafayat Hossain, Shengwei Chi, Ilya Belopolski, Yu-Xiao Jiang, Maksim Litskevich, Gang Xu, Zhaoming Tian, Arun Bansil, Zhiping Yin, Shuang Jia, Tay-Rong Chang () and M. Zahid Hasan ()
Additional contact information
Xian P. Yang: Princeton University
Yueh-Ting Yao: National Cheng Kung University
Pengyu Zheng: Beijing Normal University
Shuyue Guan: Peking University
Huibin Zhou: Peking University
Tyler A. Cochran: Princeton University
Che-Min Lin: National Cheng Kung University
Jia-Xin Yin: Southern University of Science and Technology
Xiaoting Zhou: Northeastern University
Zi-Jia Cheng: Princeton University
Zhaohu Li: Huazhong University of Science and Technology
Tong Shi: Huazhong University of Science and Technology
Md Shafayat Hossain: Princeton University
Shengwei Chi: Huazhong University of Science and Technology
Ilya Belopolski: Princeton University
Yu-Xiao Jiang: Princeton University
Maksim Litskevich: Princeton University
Gang Xu: Huazhong University of Science and Technology
Zhaoming Tian: Huazhong University of Science and Technology
Arun Bansil: Northeastern University
Zhiping Yin: Beijing Normal University
Shuang Jia: Peking University
Tay-Rong Chang: National Cheng Kung University
M. Zahid Hasan: Princeton University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The interplay of topology, magnetism, and correlations gives rise to intriguing phases of matter. In this study, through state-of-the-art angle-resolved photoemission spectroscopy, density functional theory, and dynamical mean-field theory calculations, we visualize a fourfold degenerate Dirac nodal line at the boundary of the bulk Brillouin zone in the antiferromagnet YMn2Ge2. We further demonstrate that this gapless, antiferromagnetic Dirac nodal line is enforced by the combination of magnetism, space-time inversion symmetry, and nonsymmorphic lattice symmetry. The corresponding drumhead surface states traverse the whole surface Brillouin zone. YMn2Ge2 thus serves as a platform to exhibit the interplay of multiple degenerate nodal physics and antiferromagnetism. Interestingly, the magnetic nodal line displays a d-orbital dependent renormalization along its trajectory in momentum space, thereby manifesting Hund’s coupling. Our findings offer insights into the effect of electronic correlations on magnetic Dirac nodal lines, leading to an antiferromagnetic Hund nodal line.

Date: 2024
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DOI: 10.1038/s41467-024-51255-3

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