In open Floquet lattices the integrated left-right transmission asymmetry equals the net chirality and winding contribution of an isolated Floquet band, so the asymmetry plateau is the robust topological observable.
Marcuse, Mode conversion caused by surface imper- fections of a dielectric slab waveguide, Bell System Tech- nical Journal 48, 3187–3215 (1969)
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Scattering-state theory of open Floquet lattices: transfer matrices, branch openness, and robust asymmetry
In open Floquet lattices the integrated left-right transmission asymmetry equals the net chirality and winding contribution of an isolated Floquet band, so the asymmetry plateau is the robust topological observable.