1. School
of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China
2. School
of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710062, People’s Republic of China
3. Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany
4. Beijing
National Laboratory for Condensed Matter Physics, Beijing Key Laboratory
for Nanomaterials and Nanodevices, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China