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• W4379375503 abstract "Abstract We study the electronic properties of coupled parallel polyyne chains in a couple of symmetric stacking arrangements, namely the AA stacking and the AB stacking, with the single and triple carbon bonds of one chain aligned (AA) and anti-aligned (AB) with those of the other chain. Both these arrangements described by tight-binding Hamiltonians, whose parameters are calibrated by matching low energy dispersion provided by first principle calculations, fall in the BDI class of topological classification scheme. We calculate the topological invariants for all three topological phases of the system: one for the AA stacking and 2 for the AB one. In AA stacking, both the insulating and the metallic phase belongs to the same topological phase. Whereas, the model exhibits two different values of the topological invariant in the two different insulating phases (structurally differentiated by transverse strain). In this later stacking though the transition between two distinct topological phases with the closure of the gap is practically unachievable due to the requirement of the high transverse strain. We also show the existence of four non-zero energy edge modes in the AA stacking and that of two zero energy edge modes in one of the topological phases for the AB stacking." @default.
• W4379375503 created "2023-06-06" @default.
• W4379375503 creator A5047195941 @default.
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• W4379375503 date "2023-06-21" @default.
• W4379375503 modified "2023-09-23" @default.
• W4379375503 title "Topological phases in coupled polyyne chains" @default.
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• W4379375503 doi "https://doi.org/10.1088/1361-648x/acdbae" @default.
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• W4379375503 hasPublicationYear "2023" @default.
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