Non-local correlations in metals close to a charge order insulator transition

TL;DR

This paper investigates how charge order and metal-insulator transitions occur in a 1/4-filled extended Hubbard model near a charge-ordered insulator, revealing the interplay of charge, magnetic, and electronic properties.

Contribution

It provides a detailed analysis of the charge ordering transition and associated phenomena using Cellular Dynamical Mean-Field Theory, highlighting the evolution of the Fermi surface and scattering rates.

Findings

Transition to a charge ordered Fermi liquid at VCO

Metal-insulator transition at VMI > VCO

Development of momentum-dependent scattering rates

Abstract

The charge ordering transition induced by the nearest-neighbor Coulomb repulsion, V, in the 1/4-filled extended Hubbard model is investigated using Cellular Dynamical Mean-Field Theory. We find a transition to a strongly renormalized charge ordered Fermi liquid at VCO and a metal-to-insulator transition at VMI>VCO. Short range antiferromagnetism occurs concomitanly with the CO transition. Approaching the charge ordered insulator the Fermi surface deforms and the scattering rate of electrons develops momentum dependence on the Fermi surface.