1. Department of Physics The University of Hong Kong Pokfulam Road Hong Kong Hong Kong SAR China
2. Department of Materials Science and Engineering Southern University of Science and Technology No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China
3. Department of Physics The Hong Kong University of Science and Technology Clearwater Bay Hong Kong Hong Kong SAR China
4. Department of Physics Southern University of Science and Technology No. 1088, Xueyuan Road Shenzhen Guangdong 518055 China
5. Ruđer Bošković Institute Bijenička 54 Zagreb 10000 Croatia
6. Department of Physics Faculty of Science University of Zagreb Bijenička 32 Zagreb 10000 Croatia
7. Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR China
8. Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR China
9. National Synchrotron Radiation Research Center Hsinchu Science Park Hsinchu 30076 Taiwan
10. Department of Chemical Engineering National Tsing Hua University Hsinchu 30013 Taiwan