Topological edge states induced by strained graphene

Résumé fourni par la source

Abstract Photonic realizations of the Su–Schrieffer–Heeger model typically engineer phase transitions by varying lattice site spacing to tune inter- and intra-cell couplings. In this work, we propose a strain mediated approach to realize topological phase transition by using metallic grating and a graphene sheet. The nanoscale spacing between the metallic grating and graphene sheet introduces localized graphene plasmons periodically distributed in the structure. By enforcing inhomogeneous mechanical strain on graphene, we can readily engineer the intersite coupling between localized graphene plasmons. Following this methodology, we demonstrate the topological phase transition enabled by the strained graphene and the emergence of topological edge states. Such edge states exhibit exceptional robustness against disorder, as their existence is protected by inherent chiral symmetry. Owing to the large and nearly uniform pseudomagnetic fields generated by strain in graphene, our design enables a wide tuning range and robust topological phase switching, advancing foundational frameworks for terahertz topological devices.

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