1. Department of Materials Science & Engineering, University of California at Berkeley , Berkeley, CA , United States
2. National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory , Berkeley, CA , United States
3. Erich Schmid Institute of Materials Science , Leoben , Austria
4. Department of Nuclear Engineering, University of California at Berkeley , Berkeley, CA , United States
5. Department of Mechanical Engineering, University of California at Berkeley , Berkeley, CA , United States