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Pairing and charge distribution in Emery ladders preserving the ratio of Cu to O atoms

Gökmen Polat and Eric Jeckelmann

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Phys. Rev. B 114, 185111 – Published 9 September, 2026

DOI: https://doi.org/10.1103/mby2-9ctn

Abstract

We study the Emery model (three-band Hubbard model) for superconducting cuprates on three distinct ladderlike lattices that are supercells of the CuO2 plane and thus preserve the ratio of copper to oxygen atoms. Using the density-matrix renormalization group method we confirm that these Emery ladders are charge-transfer insulators for the hole concentration corresponding to undoped cuprates but become Luther-Emery liquids with enhanced pairing correlations upon doping. The preservation of the Cu to O ratio allows us to study the distribution of charges between these atoms in the Luther-Emery phase. We show that these Emery ladders can describe the relations between charge distribution, pairing strength, and interactions that have been observed in the Emery model on two-dimensional clusters and in experiments.

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Phys. Rev. B 114, 185111– Published 9 September, 2026
  • Received 30 March 2026
  • Revised 13 July 2026
  • Accepted 19 August 2026
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