1. Department of Electrical and Computer Engineering, University of Waterloo, 200 University Ave. W, Waterloo, Ontario N2L 3G1, Canada
2. Center for Opto-Electronics Materials and Devices, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
3. Department of Physics and Astronomy, Waterloo Institute for Nanotechnology (WIN), and Institute for Quantum Computing (IQC), University of Waterloo, 200 University Ave. W, Waterloo, Ontario N2L 3G1, Canada