1. School of Electronic Information Engineering, Yangtze Normal University, Fuling, Chongqing 408100, People’s Republic of China
2. The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People’s Republic of China
3. Key Laboratory of Advanced Technologies of Materials, Ministry of Education and Institute of Materials Dynamics, Southwest Jiaotong University, Chengdu, Sichuan 610031, People’s Republic of China
4. Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, California 93106, USA
5. College of Science, Hunan Agricultural University, Changsha, Hunan 410128, People’s Republic of China