1. Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 P. R. China
2. Science, Mathematics, and Technology Singapore University of Technology and Design (SUTD) 8 Somapah Road, 487372 Singapore Singapore
3. Department of Electromechanical Engineering Faculty of Science and Technology University of Macau Macao SAR 999078 P. R. China
4. Department of Physics Zhejiang University Hangzhou 310027 P. R. China
5. Department of Applied Physics The Hong Kong Polytechnic University Hongkong SAR 610051 P. R. China
6. Department of Physics and Chemistry Faculty of Science and Technology University of Macau Macao SAR 999078 P. R. China