1. School of Materials Science and Engineering, Anhui University, Hefei 230601, China
2. School of Mechanical and Electrical Engineering, Chuzhou University, Chuzhou 239000, China
3. Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China
4. State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai 200433, China