1. National Center for Nanoscience and Technology; Beijing 100190 P. R. China
2. Department of Engineering Science and Mechanics; Materials Research Institute; The Pennsylvania State University; University Park PA 16802 USA
3. Institute of High Performance Computing; 1 Fusionopolis Way, #16-16 Connexis, A*Star Singapore 138632 Singapore
4. State Key Laboratory of New Ceramics and Fine Processing; School of Materials Science and Engineering; Tsinghua University; Beijing 100084 P. R. China
5. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 P. R. China
6. CAS Center for Excellence in Brain Science and Intelligence Technology; 320 Yue Yang Road Shanghai 200031 P. R. China