Impurity entanglement entropy in Kondo systems from conformal field theory

TL;DR

This paper uses conformal field theory to analytically study impurity entanglement entropy in Kondo systems, revealing links between the screening cloud profile and thermodynamic properties.

Contribution

It provides a novel analytical approach to connect impurity entanglement entropy with screening cloud profiles and thermodynamics in Kondo systems.

Findings

Impurity entanglement entropy reveals screening cloud characteristics.

Finite-temperature corrections link entanglement to thermodynamic observables.

Analysis applies to general non-Fermi-liquid fixed points.

Abstract

The entanglement entropy in Kondo impurity systems is studied analytically using conformal field theory. From the impurity contribution to the scaling corrections of the entanglement entropy we extract information about the screening cloud profile for general non-Fermi-liquid fixed points. By also considering the finite-temperature corrections to scaling of the von Neumann entropy we point out a direct connection between the large-distance screening cloud profile and thermodynamic observables such as the specific heat.