1. Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, Tennessee 37234-0106, United States
2. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830-8050, United States
3. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-6400, United States
4. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235-1807, United States