Robust charge-density wave correlations in the electron-doped single-band Hubbard model

TL;DR

This study demonstrates that the electron-doped single-band Hubbard model exhibits robust charge-density wave correlations, aligning with experimental observations and suggesting its relevance for understanding electron-doped cuprates.

Contribution

The paper provides the first detailed finite-temperature analysis of charge and spin correlations in the electron-doped Hubbard model using quantum Monte Carlo methods.

Findings

Charge modulations with checkerboard and unidirectional components are observed.

Correlations are inconsistent with weak-coupling Fermi surface nesting.

Results align qualitatively with resonant inelastic x-ray scattering data.

Abstract

There is growing evidence that the hole-doped single-band Hubbard and $t$-$J$ models do not have a superconducting ground state reflective of the high-temperature cuprate superconductors but instead have striped spin- and charge-ordered ground states. Nevertheless, it is proposed that these models may still provide an effective low-energy model for electron-doped materials. Here we study the finite temperature spin and charge correlations in the electron-doped Hubbard model using quantum Monte Carlo dynamical cluster approximation calculations and contrast their behavior with those found on the hole-doped side of the phase diagram. We find evidence for a charge modulation with both checkerboard and unidirectional components decoupled from any spin-density modulations. These correlations are inconsistent with a weak-coupling description based on Fermi surface nesting, and their doping dependence agrees qualitatively with resonant inelastic x-ray scattering measurements. Our results provide evidence that the single-band Hubbard model describes the electron-doped cuprates.