Electrically Pumped Microring Parity-Time-Symmetric Lasers. - William E. Hayenga; Hipolito Garcia-Gracia; Enrique Sanchez Cristobal; Midya Parto; Hossein Hodaei; Patrick LiKamWa; Demetrios N. Christodoulides; Mercedeh Khajavikhan (Proc. IEEE, 2020)