1. Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742, United States
2. Institute for Research in Electronics and Applied Physics (IREAP), University of Maryland, College Park, Maryland 20742, United States
3. Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
4. Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
5. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
6. Joint Quantum Institute (JQI), University of Maryland, College Park, Maryland 20742, United States
7. Department of Physics, University of Maryland, College Park, Maryland 20742, United States