1. State Key Laboratory of Cultivation Base for Photoelectric Technology and Functional Materials, Laboratory of Optoelectronic Technology of Shaanxi Province, National Center for International Research of Photoelectric Technology & Nano-functional Materials and Application, Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710127, China
2. School of Physics, Northwest University, Xi’an 710127, China
3. Department of Mechanical Engineering & Biomedical Engineering Program, University of South Carolina, Columbia South Carolina 29208, United States
4. Joule Physics Laboratory, School of Science, Engineering and Environment, University of Salford, Salford, Greater Manchester M5 4WT, U.K.