Two-state behaviour of Kondo trimers

TL;DR

This paper investigates the electronic and spectroscopic properties of a magnetic Kondo trimer on a metallic substrate, revealing a two-state behavior influenced by the trimer's magnetic configuration and geometry.

Contribution

It introduces a theoretical analysis of a Kondo trimer's two-state behavior and its dependence on geometry, aligning with recent experimental observations.

Findings

Resonance size depends on the magnetic state of the trimer

Electronic properties show a two-state behavior

Results agree qualitatively with recent experiments

Abstract

The electronic properties and spectroscopic features of a magnetic trimer with a Kondo-like coupling to a non-magnetic metallic substrate are analyzed at zero temperature. The substrate density of states is depressed in the trimer neighbourhood, being exactly zero at the substrate chemical potential. The size of the resonance strongly depends on the magnetic state of the trimer, and exhibits a two-state behavior. The geometrical dependence of these results agree qualitatively with recent experiments and could be reproduced in a triangular quantum dot arrangement.