Lei Wang1, Chien-Ju Chen2, *Lai Wang1, Kai-Chia Chen2, Zhibiao Hao1, Yi Luo1, Meng-Chyi Wu2, Changzheng Sun1, Yanjun Han1, Bing Xiong1, Jian Wang1, Hongtao Li1
(1. Tsinghua University, Beijing, China, 2. National Tsing Hua University, Hsinchu, Taiwan, China)