1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Integrated Circuit Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. School of Physics, University of Electronic Science and Technology of China, Chengdu, China
3. Chengdu Micro-Technology Corporation, Ltd, Chengdu, China
4. School of Electronic Science and Engineering, EHF Key Laboratory of Fundamental Science, University of Electronic Science and Technology of China, Chengdu, China