1. Keysight Technologies Canada, Kanata, ON K2K 2W5, Canada
2. Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
3. Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California at Berkeley, Berkeley, CA 94720, USA
4. Applied Math and Computational Research Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA
5. Materials Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA 94720, USA