Entanglement in Anderson Nanoclusters

TL;DR

This paper explores how two-particle spin entanglement in magnetic nanoclusters varies with temperature, magnetic field, and charge fluctuations, revealing a phase diagram that highlights the competition between Kondo screening and spin ordering.

Contribution

It introduces an entanglement phase diagram for Anderson nanoclusters, offering new insights into the interplay of charge fluctuations, magnetic field, and spin entanglement in these systems.

Findings

Multiparticle entangled states exist under finite magnetic fields.

Entanglement persists in the mixed valence regime and away from half filling.

Charge fluctuations significantly influence entanglement properties.

Abstract

We investigate the two-particle spin entanglement in magnetic nanoclusters described by the periodic Anderson model. An entanglement phase diagram is obtained, providing a novel perspective on a central property of magnetic nanoclusters, namely the temperature dependent competition between local Kondo screening and nonlocal Ruderman-Kittel-Kasuya-Yoshida spin ordering. We find that multiparticle entangled states are present for finite magnetic field as well as in the mixed valence regime and away from half filling. Our results emphasize the role of charge fluctuations.