1. Low Dimensional Quantum Physics & Device Group School of Microelectronics Xidian University 2 South Taibai Road Xi'an 710071 China
2. State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of Microelectronics Xidian University 2 South Taibai Road Xi'an 710071 China
3. Collaborative Innovation Center of Quantum Information of Shaanxi Province Xidian University Xi'an 710071 China