1. Department of Mechanical Engineering and Materials Science and Energy Sciences Institute, Yale University, New Haven, Connecticut 06511, USA
2. School of Medicine, Stanford University, Stanford, California 94305, USA
3. Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
4. Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA
5. Department of Theoretical Physics and Institute of Engineering Physics, Hanoi University of Science and Technology, Hanoi 10000, Vietnam
6. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
7. Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA
8. Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA