1 School of Physics, Beijing Institute of Technology, Beijing 100081, China.
2 School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China.
3 School of Physics, Beijing Institute of Technology, Beijing 100081, China; School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China.
4 School of Physics, Beijing Institute of Technology, Beijing 100081, China; School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China. Electronic address: yhuang@bit.edu.cn.
5 School of Physics, Beijing Institute of Technology, Beijing 100081, China; School of Integrated Circuits and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, Beijing 100081, China. Electronic address: yeliang.wang@bit.edu.cn.