1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
2. Departamento de Física, Escuela Politécnica Nacional, Quito 170525, Ecuador
3. Energy & Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
4. Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States