1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
2. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States
3. Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
4. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, United States
5. Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996, United States
6. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States