1. Department of Electrical and Computer Engineering, National University of Singapore,4 Engineering Drive 3, Singapore 117583, Singapore.
2. Singapore Institute of Manufacturing Technology, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Kinesis, Singapore 138634, Singapore.
3. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China.
4. Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Institute of Wide Bandgap Semiconductors, Xi’an Jiaotong University, Xi’an 710049, China.
5. Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
6. Istitute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.
7. Data Storage Institute, A*STAR, Singapore 138634, Singapore.
8. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
9. Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia.
10. SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Shenzhen University, Shenzhen 518060, People’s Republic of China.