1. Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan 48824, USA
2. Center for Applied Scientific Computing, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3. Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
4. New Mexico Consortium, Los Alamos, New Mexico 87544, USA