1. College of Physics and Electric Information, Luoyang Normal University, Luoyang 471934, China
2. Centre for the Physics of Materials and Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
3. Nanoacademic Technologies, Inc., Brossard, Quebec J4Z 1A7, Canada
4. Centre for Computational Sciences, Sichuan Normal University, Chengdu 610066, China