1. School of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Information Acquisition and Manipulation of Ministry of Education, Anhui University, Hefei, Anhui 230601, PR China
2. Information Materials and Intelligent Sensing Laboratory of Anhui Province, Anhui University, Hefei, Anhui 230601, PR China
3. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650000, China
4. Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Science, Hefei 230031, China