[Xu, Ying; Ma, Jun] Lanzhou Univ Technol, Dept Phys, Lanzhou 730050, Peoples R China.
[Jia, Ya; Xu, Ying] Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.
[Jia, Ya; Xu, Ying] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
[Ying, Heping] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China.
[Ma, Jun; Hayat, Tasawar] King Abdulaziz Univ, Dept Math, Fac Sci, NAAM Res Grp, Jeddah 21589, Saudi Arabia.