1. School of Electrical and Information Engineering, Hubei University of Automotive Technology,Shiyan,People's Republic of China,442002
2. College of Science, Zhongyuan University of Technology,Zhengzhou,People's Republic of China,450000
3. School of Science, Xi'an Polytechnic University,Xi'an,People's Republic of China,710048
4. COMSATS University,Department of Physics,Islamabad,Pakistan
5. School of Physics, Xian Jiaotong University,Xian,People's Republic of China,710049