1. Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, 111 Jiulong Road, Anhui University, Hefei, Anhui 230601, People's Republic of China
2. State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai 200083, People's Republic of China
3. Key Lab of Nanodevices and Applications and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), 398 Ruo Shui Road, Suzhou, Jiangsu 215123, People's Republic of China
4. Chongqing University of Science and Technology, 20 Da Xue Cheng East Road, Chongqing 401331, People's Republic of China
5. Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany