1. Department of Materials and The Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, United Kingdom
2. PhysNano Department, ITMO University, Saint-Petersburg 197101, Russia
3. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, P. R. China
4. Key Laboratory of Automobile Materials MOE, School of Material Science & Engineering, Jilin University, Changchun 130012, P. R. China
5. Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR 999077, P. R. China