1. Department of Physics, Columbia University, New York, New York 10027, United States
2. Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
3. Theory Department, Max Planck Institute for Structure and Dynamics of Matter and Center for Free-Electron Laser Science, 22761 Hamburg, Germany
4. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
5. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States
6. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
7. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
8. Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10010, United States
9. Nano-Bio Spectroscopy Group, Universidad del País Vasco UPV/EHU, San Sebastián 20018, Spain
10. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States