1. Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, United States
2. Institute for Quantum Matter, The Johns Hopkins University, Baltimore, Maryland 21218, United States
3. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, United States
4. Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, United States
5. Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, United States