Research: New magnetic Weyl semimetals

Topological semimetals offer a platform to investigate the interplay between broken-symmetry phases and topology. Three recent papers, with contributions from the CRC, report on the identification of ferromagnetic Weyl semimetals, Co₂MnGa and Co₃Sn₂S₂, through measurements of their band structure. Their results represent an important advance in the search for materials where the intersection of magnetism and topology could be exploited for next-generation technologies.

I. Belopolski, K. Manna, D. S. Sanchez, G. Chang, B. Ernst, J. Yin, S. S. Zhang, T. Cochran, N. Shumiya, H. Zheng, B. Singh, G. Bian, D. Multer, M. Litskevich, X. Zhou, S.-M. Huang, B. Wang, T.-R. Chang, S.-Y. Xu, A. Bansil, C. Felser, H. Lin, M. Z. Hasan, Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet, Science 365, 1278 (2019)

D. F. Liu, A. J. Liang, E. K. Liu, Q. N. Xu, Y.W. Li, C. Chen, D. Pei, W. J. Shi, S. K. Mo, P. Dudin, T. Kim, C. Cacho, G. Li, Y. Sun, L. X. Yang, Z. K. Liu, S. S. P. Parkin, C. Felser, Y. L. Chen, Magnetic Weyl semimetal phase in a Kagome crystal, Science 365, 1282 (2019)

N. Morali , R. Batabyal, P. Kumar Nag, E. Liu, Q. Xu, Y. Sun,B. Yan, C. Felser, N. Avraham, H. Beidenkopf, Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co₃Sn₂S₂, Science 365, 1286 (2019)