• Accepted Paper

Evolution of quasiparticle edge states with Hubbard interaction in Rice-Mele chain

Jyoti Bisht and Brijesh Kumar

APS Open Sci. - Accepted 28 October, 2026

DOI: https://doi.org/10.1103/p3sh-9gjn

Abstract

We study the behaviour of edge states in Rice-Mele model with Hubbard interaction, U, at half-filling using density matrix renormalization group, exact diagonalization and effective charge dynamics in Kumar representation. By increasing U for a fixed dimerization, δ, and staggered potential, V, we find the quasiparticle edge states in the charge gap to come down in energy from V in the absence of Hubbard interaction to zero energy at a critical interaction, Uc≈2V. This presents an uncommon situation where the competition between U and V leads to zero-energy edge states, although individually neither U nor V favours the edge states at zero energy. Upon increasing U further, the edge state energy starts increasing again until they are lost in the bulk. However, upon increasing U even further, these edge states reappear in the high energy gap. So, with Hubbard interaction, the edge states in Rice-Mele chain transmigrate from the low to high energy charge gap.

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