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journal article·2023-01Open access

Visualization of Tunable Weyl Line in A–A Stacking Kagome Magnets

Zi‐Jia Cheng, Ilya Belopolski, Hung‐Ju Tien, Tyler A. Cochran, Xian P. Yang, Wenlong Ma, Jia‐Xin Yin, Dong Chen, Junyi Zhang, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Guangming Cheng, Md. Shafayat Hossain, Qi Zhang, Maksim Litskevich, Yu‐Xiao Jiang, Nan Yao, Niels B. M. Schroeter, Vladimir N. Strocov, Biao Lian, Claudia Felser, Guoqing Chang, Shuang Jia, Tay‐Rong Chang, M. Zahid Hasan

Advanced Materials· Volume 35· Issue 3
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Abstract

Abstract Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena, in which the delicate interplay between frustrated crystal structure, magnetization, and spin–orbit coupling (SOC) can engender highly tunable topological states. Here, utilizing angle‐resolved photoemission spectroscopy, the Weyl lines are directly visualized with strong out‐of‐plane dispersion in the A–A stacked kagome magnet GdMn6Sn6. Remarkably, the Weyl lines exhibit a strong magnetization‐direction‐tunable SOC gap and binding energy tunability after substituting Gd with Tb and Li, respectively. These results not only illustrate the magnetization direction and valence counting as efficient tuning knobs for realizing and controlling distinct 3D topological phases, but also demonstrate AMn6Sn6 (A = rare earth, or Li, Mg, or Ca) as a versatile material family for exploring diverse emergent topological quantum responses.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Quantum many-body systems

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Affiliations

Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton NJ 08544 USA

Department of Physics National Cheng Kung University Tainan 70101 Taiwan

International Center for Quantum Materials School of Physics Peking University Beijing 100871 China

Max Planck Institute for Chemical Physics of Solids 01187 Dresden Germany

Department of Physics Princeton University Princeton NJ 08544 USA

Advanced Light Source E. O. Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Princeton Institute for Science and Technology of Materials Princeton University Princeton NJ 08544 USA

Swiss Light Source Paul Scherrer Institute 5232 Villigen Switzerland

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Center for Quantum Frontiers of Research and Technology (QFort) Tainan 701 Taiwan

Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Funding

U.S. Department of Energy · Office of Science · Basic Energy Sciences · Princeton Center for Complex Materials · National Science Foundation · Alfred P. Sloan Foundation · National Research Foundation Singapore · Nanyang Technological University · National Cheng Kung University · National Center for Theoretical Sciences · National Natural Science Foundation of China · European Research Council · Deutsche Forschungsgemeinschaft · Lawrence Berkeley National Laboratory

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