A topological Hund nodal line antiferromagnet

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 YMn<sub>2</sub>Ge<sub>2</sub>. 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. YMn<sub>2</sub>Ge<sub>2</sub> 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.

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Publication Details

Journal
Nature Communications
Published
2024-08-15
DOI
https://doi.org/10.1038/s41467-024-51255-3
Citations
2
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
0.68

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article

A topological Hund nodal line antiferromagnet

Huibin Zhou, Ilya Belopolski, Zhaohu Li, Shuang Jia et al.
2 citations
Nature Communications
Topological Materials and Phenomena
0.68
article

A topological Hund nodal line antiferromagnet

Huibin Zhou, Ilya Belopolski, Zhaohu Li, Shuang Jia, Gang Xu, Tyler A. Cochran, Zi‐Jia Cheng, Xiàn Yáng, Jia‐Xin Yin, Tay‐Rong Chang, Arun Bansil, Yu-Xiao Jiang, Zhiping Yin, Yueh‐Ting Yao, Zhaoming Tian, M. Zahid Hasan, Pengyu Zheng, Md Shafayat Hossain, Maksim Litskevich, Sheng‐Wei Chi, Xiaoting Zhou, Tong Shi, Che-Min Lin, Shuyue Guan
article en
2 citations

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 YMn<sub>2</sub>Ge<sub>2</sub>. 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. YMn<sub>2</sub>Ge<sub>2</sub> 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.

Nature CommunicationsVol. 15(1)
Northeastern University (US), National University of Tainan (TW), Lawrence Berkeley National Laboratory (US), Princeton University (US), Peking University (CN), Beijing Normal University (CN), Southern University of Science and Technology (CN), National Center for Theoretical Sciences (TW), Wuhan National Laboratory for Optoelectronics (CN), Huazhong University of Science and Technology Hospital (CN), University of Chinese Academy of Sciences (CN), Huazhong University of Science and Technology (CN), Wuhan Institute of Technology (CN), National Cheng Kung University (TW)
National Science Foundation, U.S. Department of Energy, Gordon and Betty Moore Foundation, Princeton University, Adolph C. and Mary Sprague Miller Institute for Basic Research in Science, University of California Berkeley, National Center for Theoretical Sciences, National Applied Research Laboratories, National Natural Science Foundation of China, VINNOVA, Svenska Forskningsrådet Formas, Chinese Academy of Sciences, Beijing Normal University, Huazhong University of Science and Technology, Vetenskapsrådet, National Cheng Kung University, Peking University, National Science and Technology Council, Office of Science, RIKEN, National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities, Basic and Applied Basic Research Foundation of Guangdong Province, Basic Energy Sciences, Air Force Office of Scientific Research, Oak Ridge National Laboratory, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
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Topological Materials and Phenomena
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