1. Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
2. Department of Physics, University of Chicago, Chicago, Illinois 60637, United States
3. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
4. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States
5. National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
6. Center for Molecular Engineering and Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States