1. School of Materials and Energy, Lanzhou University, Lanzhou, 730000, China
2. National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, & Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education, Lanzhou University, Lanzhou 730000, China
3. Lanzhou Center for Theoretical Physics & Key Laboratory of Quantum Theory and Applications of MOE, & Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, Lanzhou 730000, China