Conical diffraction from type-II Dirac point at metasurfaces Haitao Li, Chuandeng Hu, Xiaoxi Zhou, Weixin Lu, Bo Hou and Weijia Wen EPL, 130 1 (2020) 17007 Published online: 01 May 2020 DOI: 10.1209/0295-5075/130/17007