Author(s): Ilya Belopolski, Su-Yang Xu, Daniel S. Sanchez, Guoqing Chang, Cheng Guo, Madhab Neupane, Hao Zheng, Chi-Cheng Lee, Shin-Ming Huang, Guang Bian, Nasser Alidoust, Tay-Rong Chang, BaoKai Wang, Xiao Zhang, Arun Bansil, Horng-Tay Jeng, Hsin Lin, Shuang Jia, and M. Zahid Hasan
Any surface state band structure that satisfies one of four specific conditions contains topological Fermi arcs, and is therefore a Weyl semimetal.
[Phys. Rev. Lett. 116, 066802] Published Wed Feb 10, 2016