1. Huazhong University of Science and Technology,MOE Key Laboratory of Fundamental Physical Quantities Measurement, PGMF and School of Physics,Wuhan,P. R. China,430074
2. University of York,School of Physics, Engineering and Technology,U. K.,YO10 5DD
3. Shanghai University,School of Microelectronics
4. University of Leuven,ESAT Department, MNS,Belgium
5. University of Macau,Institute of Microelectronics,P. R. China