The non-Hermitian winding number of the reflection matrix links to the bulk Floquet invariant through boundary resonances, and the momentum-integrated Goos-Hänchen shift quantitatively measures the gap's topological invariant.
Jotzu et al., Experimental realization of the topologi- cal Haldane model with ultracold fermions, Nature515, 237 (2014)
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Probing Floquet topological phases via non-Hermitian skin effect of reflected waves
The non-Hermitian winding number of the reflection matrix links to the bulk Floquet invariant through boundary resonances, and the momentum-integrated Goos-Hänchen shift quantitatively measures the gap's topological invariant.