Van der Waals Epitaxial Growth of Atomically Thin Bi₂Se₃ and Thickness-Dependent Topological Phase Transition

Shuigang Xu, Yu Han, Xiaolong Chen, Zefei Wu, Lin Wang, Tianyi Han, Weiguang Ye, Huanhuan Lu, Gen Long, Yingying Wu, Jiangxiazi Lin, Yuan Cai, K. M. Ho, Yuheng He, Ning Wang