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

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• The single-band Hubbard and t-J models are crucial for understanding high-temperature cuprate superconductors.
• Previous studies suggest these models exhibit striped spin- and charge-ordered ground states for hole-doped cuprates, not superconductivity.
• A proposal exists that these models might still effectively describe electron-doped materials.

Purpose of the Study:

• To investigate the finite temperature spin and charge correlations in the electron-doped Hubbard model.
• To contrast these correlations with those observed in the hole-doped side of the phase diagram.
• To determine if the single-band Hubbard model can describe electron-doped cuprates.

Main Methods:

• Utilizing quantum Monte Carlo dynamical cluster approximation calculations.
• Analyzing spin and charge correlations at finite temperatures.
• Comparing results with theoretical predictions and experimental data.

Main Results:

• Evidence found for charge modulation with both checkerboard and unidirectional components.
• Observed charge modulations are decoupled from any spin-density modulations.
• The doping dependence of these correlations aligns qualitatively with resonant inelastic x-ray scattering measurements.

Conclusions:

• The single-band Hubbard model provides a valid description for electron-doped cuprates.
• The observed charge modulations are inconsistent with weak-coupling theories based on Fermi surface nesting.
• The study offers insights into the complex electronic behavior of cuprate materials.