1. School of Physics and Astronomy University of Birmingham Birmingham B15 2TT UK
2. Chair in Hybrid Nanosystems Nanoinstitute Munich Faculty of Physics Ludwig Maximilians University of Munich 80539 Munich Germany
3. College of Engineering Bay Campus Swansea University Swansea SA1 8EN UK
4. National Laboratory of Solid‐State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China
5. Department of Physics Imperial College London London SW7 2AZ UK
6. Department of Physics University of Hong Kong Hong Kong China
7. Department of Electrical & Electronic Engineering University of Hong Kong Hong Kong China