1. MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
2. MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Optics & Photonics, Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
3. Zhijing Nanotech (Beijing) Co., Ltd., Beijing 100081, People’s Republic of China
4. School of Physics and Engineering, ITMO University, Kronverksky Pr. 49, St. Petersburg 197101, Russia