[1] Tokyo Univ Sci, Dept Elect Engn, 2641 Yamazaki, Noda, Chiba 2788510, Japan
[2] Univ Dhaka, Dept Theoret Phys, Dhaka 1000, Bangladesh
[3] City Univ, Dept Elect Engn, Savar,Birulia, Dhaka 1216, Bangladesh
[4] Tokyo Univ Sci, Res Inst Sci & Technol, 2641 Yamazaki, Noda, Chiba 2788510, Japan