Correlated adatom trimer on metal surface: A continuous time quantum Monte Carlo study

TL;DR

This paper uses a numerically exact continuous time quantum Monte Carlo method to study how interactions among three magnetic impurities on a metal surface affect the Kondo effect, revealing geometry-dependent suppression and magnetic frustration effects.

Contribution

It provides a detailed analysis of three interacting Kondo impurities, highlighting differences between Heisenberg and Ising interactions and exploring magnetic frustration effects.

Findings

Suppression of Kondo resonance by interatomic exchange interactions.

Significant differences between Heisenberg and Ising cases for antiferromagnetic coupling.

Investigation of magnetic frustration effects and their experimental relevance.

Abstract

The problem of three interacting Kondo impurities is solved within a numerically exact continuous time quantum Monte Carlo scheme. A suppression of the Kondo resonance by interatomic exchange interactions for different cluster geometries is investigated. It is shown that a drastic difference between the Heisenberg and Ising cases appears for antiferromagnetically coupled adatoms. The effects of magnetic frustrations in the adatom trimer are investigated, and possible connections with available experimental data are discussed.