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    High winding number in rhombohedrally stacked Su-Schrieffer-Heeger multilayers

    Feng Lu1, Ao Zhou1, Shujie Cheng1,2,*, and Gao Xianlong1,†

    • *Contact author: chengsj@zjnu.edu.cn
    • †Contact author: gaoxl@zjnu.edu.cn

    Phys. Rev. B 114, 024203 – Published 6 July, 2026

    DOI: https://doi.org/10.1103/ctfq-jsj1

    Abstract

    We study the topological properties of rhombohedrally stacked N-layer Su-Schrieffer-Heeger networks with interlayer coupling. We find that these systems exhibit 2N-fold degenerate zero-energy edge states with winding number W=N, providing a direct route to high winding number topological phases where W equals the layer number. Using effective Hamiltonian theory, we demonstrate that the winding number scales linearly with N through a layer-by-layer topological amplification mechanism. We introduce the Wigner entropy as a detection method for these edge states, showing that topological edge states exhibit significantly enhanced Wigner entropy compared to bulk states. Our results establish rhombohedral stacking as a systematic approach for engineering high winding number topological insulators with potential applications in quantum information processing.

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