Export citation

Export citation

Choose format for download:

Download Citation

    Continuum limit of bipartite lattices: The Su-Schrieffer-Heeger model

    Fotios K. Diakonos1,* and Peter Schmelcher2,3,†

    • *Contact author: fdiakono@phys.uoa.gr
    • †Contact author: peter.schmelcher@uni-hamburg.de

    Phys. Rev. B 112, 205419 – Published 17 November, 2025

    DOI: https://doi.org/10.1103/j12q-6bhm

    Abstract

    We present a continuous nonlocal model that faithfully replicates the rich topological and spectral features of the Su-Schrieffer-Heeger (SSH) model. Remarkably, our model shares the SSH models' bulk energy spectrum, eigenstates, and Zak phase—hallmarks of its topological character—while introducing a tunable length-scale a quantifying nonlocality. This parameter allows for a controlled interpolation between nonlocal and local regimes. Furthermore, for a specific value of a the exact spectral equivalence to the discrete SSH model is established. Distinct from previous continuous analogs based on Schrödinger or Dirac-type Hamiltonians, our approach maintains chiral symmetry, does not require an external potential, and features periodic energy bands. On finite domains, the model supports a flat band with zero energy formed by a countable infinite set of exponentially localized zero-energy edge states of topological origin. Beyond SSH, our method lays the foundation for constructing nonlocal, continuous analogs of a wide class of bipartite and multipartite lattices, opening paths for theoretical exploration and challenges for experimental realization in topological quantum matter.

    Physics Subject Headings (PhySH)

    Authorization Required

    We need you to provide your credentials before accessing this content.

    References (Subscription Required)

    Outline

    Information

    Sign In to Your Journals Account

    Filter

    Filter

    Article Lookup

    Enter a citation