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• W3103583975 startingPage "305601" @default.
• W3103583975 abstract "We study two-particle states in a Su–Schrieffer–Heeger (SSH) chain with periodic boundary conditions and nearest-neighbor (NN) interactions. The system is mapped into a problem of a single particle in a two-dimensional (2D) SSH lattice with potential walls along specific edges. The 2D SSH model has a trivial Chern number but a non-trivial Zak's phase, the one-dimensional (1D) topological invariant, along specific directions of the lattice, which allow for the presence of topological edge states. Using center-of-mass and relative coordinates, we calculate the energy spectrum of these two-body states for strong interactions and find that, aside from the expected appearance of doublon bands, two extra in-gap bands are present. These are identified as bands of topological states localized at the edges of the internal coordinate, the relative distance between the two particles. As such, the topological states reported here are intrinsically many-body in what concerns their real space manifestation, having no counterpart in single-particle states derived from effective models. Finally, we compare the effect of Hubbard interactions with that of NN interactions to show how the presence of the topological bound states is specific to the latter case." @default.
• W3103583975 created "2020-11-23" @default.
• W3103583975 creator A5054187803 @default.
• W3103583975 creator A5073871789 @default.
• W3103583975 date "2018-07-04" @default.
• W3103583975 modified "2023-10-17" @default.
• W3103583975 title "Topological bound states in interacting Su–Schrieffer–Heeger rings" @default.
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• W3103583975 doi "https://doi.org/10.1088/1361-648x/aacd7c" @default.
• W3103583975 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29916811" @default.
• W3103583975 hasPublicationYear "2018" @default.
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