1. Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
2. Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 0NG, United Kingdom
3. Imaging and Characterization Core Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia
4. Development Center, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China