1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
2. Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
3. Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195, United States
4. Institute of High Performance Computing, A-STAR, Singapore
5. Department of Civil and Environmental Engineering and Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
6. Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States.