1. Department of Physics and Optoelectronic Engineering
2. Yangtze University
3. Jingzhou 434023
4. China
5. School of Mathematics and Physics
6. China University of Geosciences (Wuhan)
7. Wuhan 430074
8. Department of Physics
9. Florida A&M University, Tallahassee
10. Tallahassee
11. USA