Floquet topological edge states can zero out the PT symmetry breaking threshold when they overlap gain/loss defects, and they do so unconditionally at low driving frequencies.
In this system, waveguides arranged in alternating upper and lower rows are periodically bent along the longitudinal propagation dire ction (z)
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Controlling the $\mathcal{PT}$ Symmetry Breaking Threshold in Bipartite Lattice Systems with Floquet Topological Edge States
Floquet topological edge states can zero out the PT symmetry breaking threshold when they overlap gain/loss defects, and they do so unconditionally at low driving frequencies.