[1] Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
[2] Peking Univ, Sch Phys, Frontiers Sci Ctr Nanoptoelect, Beijing 100871, Peoples R China
[3] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China
[4] Peking Univ, Yangtze Delta Inst Optoelect, Nantong 226010, Jiangsu, Peoples R China