1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120, United States
3. Department of Physics, University of Washington, Seattle, Washington 98195-1560, United States
4. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China
5. Physics and Astronomy Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia