Topological Graphene plasmons in a plasmonic realization of the Su-Schrieffer-Heeger Model

Abstract

Graphene hybrids, made of thin insulators, graphene, and metals can support propagating acoustic plasmons (AGPs). The metal screening modifies the dispersion relation of usual graphene plasmons leading to slowly propagating plasmons, with record confinement of electromagnetic radiation. Here, we show that a graphene monolayer, covered by a thin dielectric material and an array of metallic nanorods can be used as a robust platform to emulate the Su-Schrieffer-Heeger model. We calculate the Zak's phase of the different plasmonic bands to characterise their topology. The system shows bulk-edge correspondence: strongly localized interface states are generated in the domain walls separating arrays in different topological phases. We find signatures of the nontrivial phase which can directly be probed by far-field mid-IR radiation, hence allowing a direct experimental confirmation of graphene topological plasmons. The robust field enhancement, highly localized nature of the interface states, and their gate-tuned frequencies expand the capabilities of AGP-based devices.

5 pages, 4 figures

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Cited by in corpus (10)

• A brief review of topological photonics in one, two, and three dimensions
• Topological phase detection through high-harmonic spectroscopy in extended Su-Schrieffer-Heeger chains
• Topology in a one-dimensional plasmonic crystal
• Co-existing topological and Volkov-Pankratov plasmonic edge states in magnetized graphene
• Exceptional points in SSH-like models with hopping amplitude gradient
• Dirac plasmon polaritons and magnetic modes in topological-insulator nanoparticles
• Image polaritons in van der Waals crystals
• Screened topological plasmons in graphene plasmonic crystals
• Coupled electric dipole model for a Su-Schrieffer-Heeger chain of optically resonant coreshell nanoparticles
• Rhombohedral graphite junctions as a platform for continuous tuning between topologically trivial and non-trivial electronic phases