1. College of Physical Science and Technology, Heilongjiang University, Harbin 150080, People's Republic of China
2. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
3. Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
4. Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China