1. Faculty of Science, Yibin University, Yibin 644000, Sichuan, China
2. Key Laboratory of Computational Physics of Sichuan Province, Yibin University, Yibin 644000, China
3. Department of Bionanotechnology, Hanyang University, Ansan 155-88, South Korea
4. Department of Fundamental Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
5. Department of Mathematics and Statistics, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia
6. Department of Mathematics, College of Science, Al-Zulfi, Majmaah University, Al Majmaah 11952, Saudi Arabia