Magnetization-direction-tunable kagome Weyl line
cond-mat.str-el
/ Authors
Zi-Jia Cheng, Ilya Belopolski, Tyler A. Cochran, Hung-Ju Tien, Xian P. Yang, Wenlong Ma, Jia-Xin Yin, Junyi Zhang, Chris Jozwiak, Aaron Bostwick
and 14 more authors
Eli Rotenberg, Guangming Cheng, Md. Shafayat Hossain, Qi Zhang, Nana Shumiya, Daniel Multer, Maksim Litskevich, Yuxiao Jiang, Nan Yao, Biao Lian, Guoqing Chang, Shuang Jia, Tay-Rong Chang, M. Zahid Hasan
/ Abstract
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.