Mechanism for enhanced disordered screening in strongly correlated metals: local vs. nonlocal effects

TL;DR

This paper investigates how electron-electron interactions influence disorder screening in strongly correlated metals, highlighting the roles of local and nonlocal effects and demonstrating DMFT's effectiveness over weak-coupling approaches.

Contribution

It compares Hartree-Fock and DMFT methods to reveal the suppression of disorder screening effects in strongly correlated Fermi liquids.

Findings

Both local and nonlocal disorder contributions are suppressed in strongly renormalized Fermi liquids.

DMFT captures higher-order effects missed by weak-coupling theories.

Results support DMFT's power in describing complex electron interactions.

Abstract

We study the low temperature transport characteristics of a disordered metal in the presence of electron-electron interactions. We compare Hartree-Fock and dynamical mean field theory (DMFT) calculations to investigate the scattering processes of quasiparticles off the screened disorder potential and show that both the local and non-local (coming from long-ranged Friedel oscillations) contributions to the renormalized disorder potential are suppressed in strongly renormalized Fermi liquids. Our results provide one more example of the power of DMFT to include higher order terms left out by weak-coupling theories.