Impurity Entanglement Entropy and the Kondo Screening Cloud
Strongly Correlated Electrons
2007-05-23 v1 Mesoscale and Nanoscale Physics
Quantum Physics
Abstract
The screening of an impurity spin by conduction electrons is associated with the formation of a large Kondo screening cloud, of size xi_K. We study the quantum entanglement between a region of size r surrounding the impurity and the rest of the sample, (of total size R) using Density Matrix Renormalization Group and analytic methods. The corresponding "impurity entanglement entropy", S_{imp}, is shown to be a universal scaling function of r/xi_K and r/R. We calculate this universal function using Fermi liquid theory in the regime xi_K << r.
Cite
@article{arxiv.cond-mat/0606705,
title = {Impurity Entanglement Entropy and the Kondo Screening Cloud},
author = {Erik S. Sørensen and Ming-Shyang Chang and Nicolas Laflorencie and Ian Affleck},
journal= {arXiv preprint arXiv:cond-mat/0606705},
year = {2007}
}
Comments
5 pages, 5 figures (eps), RevTeX 4.0