1. Department of Chemistry and Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States
2. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3. Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
4. ICQD/Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly Coupled Quantum Matter Physics, and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
5. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh Pennsylvania 15260, United States
6. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States