1. Lawrence Livermore
National Laboratory, Livermore, California 94550, United States
2. Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801 United States
3. Material Science
and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States and
4. Computer Science
and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States