Tight-binding reproduces spatial intensity distributions but fails to capture complex oscillatory phase dynamics when benchmarked against exact z-dependent SUSY solutions in longitudinally modulated PT-symmetric waveguides.
For the localized modes ψl,r to return to their initial configuration, both phase factors must reduce to unity simultaneously
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Exact versus tight-binding models in longitudinally modulated $\mathcal{PT}$-symmetric coupled waveguides
Tight-binding reproduces spatial intensity distributions but fails to capture complex oscillatory phase dynamics when benchmarked against exact z-dependent SUSY solutions in longitudinally modulated PT-symmetric waveguides.