1. Department of Physics, University of Washington, Seattle, Washington 98195, United States
2. Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China
3. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
4. National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
5. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
6. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States