1. School of Biological and Food Engineering, Hefei Normal University, Hefei, Anhui 230601, P.R. China
2. High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China
3. High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, P.R. China