1. Condensed
Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080, China
2. School
of Materials and Engineering, Harbin Institute of Technology, Harbin 150001, China
3. Key
Laboratory for Photonic and Electronic Bandgap Materials, Ministry
of Education, Harbin Normal University, Harbin 150025, China
4. Materials
Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States