1. State
Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, #2 Linggong Road, Gaoxinyuan District, Dalian 116024, P. R. China
2. Department
of Physics, Peking University, 209 Chengfu Road, Beijing 100871, P. R. China
3. Graduate
School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0196, Japan