Visualization of tunable Weyl line in A-A stacking kagome magnets

• Main Authors: Cheng, Zi-Jia, Belopolski, Ilya, Tien, Hung-Ju, Cochran, Tyler A., Yang, Xian P., Ma, Wenlong, Yin, Jia-Xin, Chen, Dong, Zhang, Junyi, Jozwiak, Chris, Bostwick, Aaron, Rotenberg, Eli, Cheng, Guangming, Hossain, Md. Shafayat, Zhang, Qi, Litskevich, Maksim, Jiang, Yu-Xiao, Yao, Nan, Schroeter, Niels B. M., Strocov, Vladimir N., Lian, Biao, Felser, Claudia, Chang, Guoqing, Jia, Shuang, Chang, Tay-Rong, Hasan, M. Zahid
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics::Electricity and magnetism; Spin–Orbit Coupling; Tunability
• Online Access: https://hdl.handle.net/10356/164951
• Institution: Nanyang Technological University

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, we directly visualize the Weyl lines 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. Our results not only illustrate the magnetization direction and valence counting as efficient tuning knobs for realizing and controlling distinct three-dimensional topological phases, but also demonstrate AMn6Sn6 (A = rare earth or Li, Mg, Ca) as a versatile material family for exploring diverse emergent topological quantum responses.