Mechanism for Enhanced Disordered Screening in Strongly Correlated Metals: Local vs. Nonlocal Effects
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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.
KeywordsDisorder Strong correlations Perturbation theory Dynamical mean-field theory
This research was supported by the DFG through FOR 960 and GRK 1621 (ECA), by FAPESP through grant 07/57630-5 (EM), CNPq through grant 304311/2010-3 (EM), and by the NSF through grant DMR-0542026 (VD). The authors thank Lev Gor’kov for pointing out the role of vertex corrections in the Holstein model.
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