1. Department of Physics, Hangzhou Normal University, 16 Xuelin Street, Hangzhou, Zhejiang 310036, China
2. Institute of Service Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Cangqian, Hangzhou, Zhejiang 311121, China
3. Quantum Theory Project, Department of Physics and Department of Chemistry, University of Florida, P.O. Box 118435, Gainesville, Florida 32611-8435, USA