College of physics science and technology, Shenyang normal university, Shenyang, China
College of physics science and technology, Shenyang normal university, Shenyang, China
College of physics science and technology, Shenyang normal university, Shenyang, China
College of physics science and technology, Shenyang normal university, Shenyang, China
Copyright © Shuzhi Zhang, Yufu Deng, Xin Shao, Yue Ma et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.