1. College of Physics Science and Technology, Yangzhou University, Jiangsu 225009, P. R. China
2. Department of Physics, University of Sargodha, 40100 Sargodha, Pakistan
3. School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tongyan Road 38, Tianjin 300350, P. R. China
4. National Supercomputer Center in Tianjin, Tianjin 300457, P. R. China