1. Department of Electrical & Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
2. International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at Microscale, and CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
4. Department of Materials Science & Engineering, University of Utah, Salt Lake City, Utah 84112, United States