1. Quantum Materials Science Unit Okinawa Institute of Science and Technology Graduate University Okinawa 904‐0495 Japan
2. Nanoscale Quantum Photonics Laboratory RIKEN Cluster for Pioneering Research Saitama 351‐0198 Japan
3. Quantum Optoelectronics Research Team RIKEN Center for Advanced Photonics Saitama 351‐0198 Japan
4. Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology, Anhui University Hefei 230601 China
5. Low Energy Electronic Systems Singapore‐MIT Alliance for Research and Technology Singapore 138602 Singapore
6. College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China
7. Queensland Micro and Nanotechnology Centre Griffith University 170 Kessels Road Nathan Queensland 4111 Australia