1. Key Laboratory of Microelectronics Devices and Integrated Technology Institute of Microelectronics of the Chinese Academy of Sciences No. 3 Beitucheng West Road, Chaoyang District Beijing 100029 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Department of Mathematics and Theories Peng Cheng Laboratory No. 2, Xingke 1st Street, Nanshan Shenzhen 518000 China