1. Inner Mongolia Key Lab of Nanoscience and Nanotechnology and School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, People’s Republic of China
2. Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place Saskatoon, Canada
3. The First Senior Middle School of Zhungeer, Zhungeer 010400, People’s Republic of China
4. College of Science, Inner Mongolia Agricultural University, Hohhot 010018, People’s Republic of China
5. College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, People’s Republic of China