Chiral Majorana fermion modes on the surface of superconducting topological insulators Ching-Kai Chiu, Guang Bian, Hao Zheng, Jia-Xin Yin, Songtian S. Zhang, D. S. Sanchez, I. Belopolski, Su-Yang Xu and M. Zahid Hasan EPL, 123 4 (2018) 47005 Published online: 21 September 2018 DOI: 10.1209/0295-5075/123/47005