Screening of a single impurity and Friedel oscillations in Fermi liquids

Abstract

We numerically study Friedel Oscillations and screening effect around a single impurity in one- and two-dimensional interacting lattice electrons. The interaction between electrons is accounted for by using a momentum independent self-energy obeying the Luttinger theorem. It is observed in one-dimensional systems that the amplitude of oscillations is systematically damped with increasing the interaction while the period remains unchanged. The variation of screening charge with the impurity potential is discussed. We see that the screening charge is suppressed by the interactions. In case of two-dimensional systems the surface oscillations around the impurity are more localized with increasing the interactions.

arXiv comment6 pages,7 figures, proceedings SCES2014

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• Real-space dynamical mean-field theory of Friedel oscillations in strongly correlated electron systems
• Impurities and other defects in correlated lattice electrons: Friedel oscillations and interference patterns
• Charge waves and dynamical signatures of topological phases in Su-Schrieffer-Heeger chains