Affiliation: | [1]School of Physics Material Science, Anhui University, Hefei 230039 [2]School of Electronic and Information Engineering, Hefei Normal University, Hefei 230601 [3]Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026 [4]Department of Physics, Fuyang Teachers College, Fuyang 236041 |