Helicity-dependent THz emission induced by ultrafast spin photocurrent in nodal-line semimetal candidate Mg3Bi2 Journal title: Opto-Electronic Advances Authors: Mingyu Tong, Yuze Hu, Xiangnan Xie, Xiegang Zhu, Zhenyu Wang*, Xiang'ai Cheng, Tian Jiang* Subject(s): Electrical and Electronic Engineering, Engineering, Nanotechnology, Technology, Remote Sensing, Optics