1. School of Physical Science and Technology, Southwest University, Chongqing 400715, China
2. School of Science, Southwest University of Science and Technology, Mianyang 621010, China
3. College of Physics and Electronic Engineering, Nanyang Normal University, 1638 Wolong Road, Nanyang 473061, China
4. Department of Science and Environmental Studies, The Education University of Hong Kong, 10 Lo Ping Road, Tai Po, New Territories, Hong Kong, China
5. School of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China
6. School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China