Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena. Here, utilizing angle-resolved photoemission spectroscopy, we demonstrate Weyl lines with strong out-of-plane dispersion in an A-A stacked kagome magnet TbxGd1-xMn6Sn6. On the Gd rich side, the Weyl line remains nearly spin-orbit-gapless due to a remarkable cooperative interplay between Kane-Mele spin-orbit-coupling, low site symmetry and in-plane magnetic order. Under Tb substitution, the kagome Weyl line gaps due to a magnetic reorientation to out-of-plane order. Our results illustrate the magnetic moment direction as an efficient tuning knob for realizing distinct three-dimensional topological phases.
@article{arxiv.2203.10648,
title = {Magnetization-direction-tunable kagome Weyl line},
author = {Zi-Jia Cheng and Ilya Belopolski and Tyler A. Cochran and Hung-Ju Tien and Xian P. Yang and Wenlong Ma and Jia-Xin Yin and Junyi Zhang and Chris Jozwiak and Aaron Bostwick and Eli Rotenberg and Guangming Cheng and Md. Shafayat Hossain and Qi Zhang and Nana Shumiya and Daniel Multer and Maksim Litskevich and Yuxiao Jiang and Nan Yao and Biao Lian and Guoqing Chang and Shuang Jia and Tay-Rong Chang and M. Zahid Hasan},
journal= {arXiv preprint arXiv:2203.10648},
year = {2022}
}