1. Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
2. Computational Science Program, University of Texas at El Paso, El Paso, Texas 79968, United States
3. Department of Physics, University of Texas at El Paso, El Paso, Texas 79968, United States
4. Physics Department and Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, Michigan 48859, United States