1. National Center
for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States
2. Computer Science
and Mathematics Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Tennessee,
United States
3. Center for Nanophase
Materials Sciences, Oak Ridge National Laboratory, Tennessee, United States
4. Instituto de Fı́sica
Arroyo Seco, Universidad Nacional del Centro de la Provincia de Buenos Aires, Tandil, Argentina
5. Department of Mathematical
Sciences, New Jersey Institute of Technology, Newark, New Jersey, United States
6. Department of Materials
Sciences and Engineering, University of Tennessee, Knoxville, Tennessee, United States