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Zigzag nanoribbons hosting the Haldane Chern insulator model are considered.In this context, a reentrant topological phase, characterized by the emergenceof quasi zero dimensional in-gap states, is discussed. The bound states, whichreside in the gap opened by the hybridization of the counter-propagating edgemodes of the Haldane phase, are localized at the ends of the strip and arefound to be robust against on-site disorder. These findings are supported bythe behavior of the Zak phase over the parameter space, which exhibits jumps of$\pi$ in correspondence to the phase transitions between the trivial and thenon-trivial phases. The effective mass inversion leading to the jumps in theZak phase is interpreted in a low energy framework. Setups with non-uniformparameters also show topological bound states via the Jackiw-Rebbi mechanism.All the properties reported are shown to be extremely sensitive to the stripwidth.

Emerging topological bound states in Haldane model zigzag nanoribbons