Parity-time–symmetric microring lasers

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The emergence, coalescence and topological properties of multiple exceptional points and their experimental realization (2015, background): “[5,6], loss-induced revival of lasing [7], single-mode lasers [8,9], reversed pump dependence of lasers [10], Bloch oscillation [11], coherent absorption [12], optical isolation [13], unidirectional light propagation [14–16], and others [17–23].”
Symmetry and Topology in Non-Hermitian Physics (2018, background): “jp been shown that these mathematical properties lead to a number of unique phenomena and functionalities with no counterparts in Hermitian systems in both theory [39– 70] and experiments [71–99].”