Uniaxial strain and obliquely incident circularly polarized light stabilize a Floquet second-order topological insulator in graphene featuring gapped edges and robust corner modes.
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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.
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Floquet second-order topological insulator in strained graphene
Uniaxial strain and obliquely incident circularly polarized light stabilize a Floquet second-order topological insulator in graphene featuring gapped edges and robust corner modes.
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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.