1. Condensed Matter
Science and Technology Institute, School of Science, Harbin Institute of Technology, Harbin 150080, China
2. Department of Materials Science and Engineering
and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Electronic Materials Research Laboratory, Key Laboratory
of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China
4. National
Laboratory of Solid State Microstructures and Department of Materials
Science and Engineering, Nanjing University, Nanjing 210093, China
5. Department of Mathematics and Materials
Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States