1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
2. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
5. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China