A hexagonal-unit 1D chain with alternating hoppings shows two insulating phases separated by a gap-closing transition, with exponentially localized edge states in the topological regime below a critical hopping ratio.
Onipko, Spectrum of π electrons in graphene as an al- ternant macromolecule and its specific features in quan- tum conductance, Phys
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Topological edge states of the hexagonal linear chain
A hexagonal-unit 1D chain with alternating hoppings shows two insulating phases separated by a gap-closing transition, with exponentially localized edge states in the topological regime below a critical hopping ratio.