Manipulation of edge states in microwave artificial graphene

Abstract

Edge states are one important ingredient to understand transport properties of graphene nanoribbons. We study experimentally the existence and the internal structure of edge states under uniaxial strain of the three main edges: zigzag, bearded, and armchair. The experiments are performed on artificial microwave graphene flakes, where the wavefunctions are obtained by direct imaging. We show that uniaxial strain can be used to manipulate the edge states: a single parameter controls their existence and their spatial extension into the ribbon. By combining tight-binding approach and topological arguments, we provide an accurate description of our experimental findings. A new type of zero-energy state appearing at the intersection of two edges, namely the corner state, is also observed and discussed.

arXiv comment15 pages, 9 figures

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• Experimental observation of topological exciton-polaritons in transition metal dichalcogenide monolayers
• Spectral imaging of topological edge states in plasmonic waveguide arrays
• Semi-Dirac Transport and Anisotropic Localization in Polariton Honeycomb Lattices
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• The Existence of Topological Edge States in Honeycomb Plasmonic Lattices
• Photonic realization of a generic type of graphene edge states exhibiting topological flat band
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• Lattice-layer entanglement in Bernal-stacked bilayer graphene
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• Exact lattice-model calculation of boundary modes for Weyl semimetals and graphene