1. Department of Physics, South China University of Technology, Guangzhou 510640, People’s Republic of China
2. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China
3. Department of Physics, Yantai University, Yantai 264005, People’s Republic of China
4. Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510640, People’s Republic of China