1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
2. Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260 United States
3. CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
4. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States