Single-mode laser by parity-time symmetry breaking

By Liang Feng, Z. Wong, R. Ma, Yuan Wang, Xiang Zhang. Science, 2014

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Nonlinear switching and solitons in PT‐symmetric photonic systems (2015, background): “Such sensitivity of amplification to PT-breaking threshold could be used to discriminate between multiple spectral modes, analogous to the concept of PT-lasers [12, 13].”
Experimental realization of a Weyl exceptional ring (2018, background): “[42] Liang Feng, Zi Jing Wong, Ren-Min Ma, Yuan Wang,”
Non-Hermitian robust edge states in one dimension: Anomalous localization and eigenspace condensation at exceptional points (2017, background): “EPs, which can also be of higher-order [22–26] as in this work, lead to intriguing phenomena such as unidirectional invisibility [27], single-mode lasers [28, 29], or enhanced sen-”
Topological Phases of Non-Hermitian Systems (2018, background): “[85] Liang Feng, Zi Jing Wong, Ren-Min Ma, Yuan Wang, and Xiang Zhang, “Single-mode laser by parity-time symmetry breaking,” Science 346, 972 (2014).”
Exceptional points in optics and photonics (2019, background): “6A) and in single ringswith embedded active-passive gratings (106) (Fig.”
Nonlinear waves in PT -symmetric systems (2016, methodology): “In the experiment by Feng et al. (2014), the PT - symmetric microring resonator was designed with 500- nm-thick InGaAsP multiple quantum wells (MQWs) on an InP substrate [Fig.”