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.
Floquet, Sur les équations différentielles linéaires à coefficients périodiques, Annales scientifiques de l’École normale supérieure 12, 47–88 (1883)
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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.