1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China
2. Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, United States
3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
4. Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United States
5. Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China