1. Institute of Applied Physics and Materials Engineering University of Macau Macao SAR 999078 China
2. Department of Electromechanical Engineering Faculty of Science and Technology University of Macau Macao SAR 999078 China
3. Department of Physics and Chemistry Faculty of Science and Technology University of Macau Macao SAR 999078 China
4. Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way Innovis 138634 Singapore
5. Department of Applied Physics The Hong Kong Polytechnic University Hung Hom, Kowloon Hong Kang China