[1] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Peoples R China
[2] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Peoples R China
[3] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China