1. Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, United States
2. Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, United States
3. Department of Physics and W. M. Keck Computational Materials Theory Center, California State University, Northridge, Northridge, California 91330, United States
4. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, United States