1. School of Materials Science and Engineering, National Institute for Advanced Materials, Smart Sensing Interdisciplinary Science Center, Nankai University, Tongyan Road 38, Tianjin 300350, P. R. China
2. National Supercomputer Center in Tianjin, Tianjin 300457, P. R. China
3. Department of Physics, Yantai University, Yantai 264005, P. R. China
4. Department of Physics, Yangzhou University, Yangzhou 225009, P. R. China