affiliation not provided to SSRN, University of Electronic Science and Technology of China (UESTC), affiliation not provided to SSRN, University of Electronic Science and Technology of China (UESTC) - State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC) and University of Electronic Science and Technology of China (UESTC) - State Key Laboratory of Electronic Thin Films and Integrated Devices