[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R China
[4] Natl Univ Singapore, Dept Phys, Singapore 117551, Singapore
[5] Natl Univ Singapore, Ctr Biosensing Sci, Dept Biol Sci, Singapore 117557, Singapore
[6] Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100871, Peoples R China
[7] Peking Univ, Acad Adv Interdisciplinary Studies, Ctr Nanosci & Nanotechnol, Beijing 100871, Peoples R China