1. Center
for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 United States
2. Beijing Computational Science Research Center, Beijing 100094, China
3. Department
of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, United States
4. Department
of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 United States
5. Department
of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045 United States