1. National Laboratory of Solid State Microstructures
2. Collaborative Innovation Center of Advanced Microstructures
3. Department of Physics
4. Eco-material and Renewable Energy Research Center (ERERC)
5. Nanjing University
6. School of Power and Mechanical Engineering
7. Wuhan University
8. Wuhan 430072
9. P. R. China
10. College of Engineering and Applied Science
11. Nanjing 210093