[1] Soochow Univ, Inst Adv Study, Suzhou 215006, Peoples R China
[2] Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
[5] Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
[6] Chongqing Univ, Chongqing Key Lab Strongly Coupled Phys, Chongqing 400044, Peoples R China