1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
2. Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204, USA.
3. Department of Electrical Information Engineering, Henan University of Engineering, Xinzheng, Henan 451191, China.
4. Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA.
5. Department of Mechanical Engineering, University of Kansas, Lawrence, KS 66045, USA.
6. Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA.
7. Materials Science and Engineering, University of Houston, Houston, TX 77204, USA.
8. Department of Mechanical Engineering, University of Houston, Houston, TX 77204, USA.