1. Laboratory for Physical Sciences, 8050 Greenmead Drive, College Park, Maryland 20740, United States
2. Department of Physics, University of Maryland, College Park, Maryland 20742, United States
3. Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
4. Center for Computing Research, Sandia National Labortaries, Albuquerque, New Mexico 87185, United States
5. Sandia National Laboratories, Albuquerque, New Mexico 87185, United States