Spectral properties and the Kondo effect of cobalt adatoms on silicene

TL;DR

This paper investigates the spectral properties and Kondo effect of cobalt adatoms on silicene using advanced computational methods, revealing tunable Kondo resonance, magnetic field effects, and spin polarization control.

Contribution

It introduces a first-principles based effective Hamiltonian to analyze the Kondo effect and spin polarization in Co adatoms on silicene, providing new insights into their tunability.

Findings

Kondo resonance with a few Kelvin Kondo temperature can be achieved.

External magnetic field causes splitting and evolution of the Kondo peak.

Spin polarization of the spectral function can be significantly tuned electrically.

Abstract

In terms of the state-of-the-art first principle computational methods combined with the numerical renormalization group technique the spectroscopic properties of Co adatoms deposited on silicene are analyzed. By establishing an effective low-energy Hamiltonian based on first principle calculations, we study the behavior of the local density of states of Co adatom on external parameters, such as magnetic field and gating. It is shown that the Kondo resonance with the Kondo temperature of the order of a few Kelvins can emerge by fine-tuning the chemical potential. The evolution and splitting of the Kondo peak with external magnetic field is also analyzed. Furthermore, it is shown that the spin polarization of adatom's spectral function in the presence of magnetic field can be relatively large, and it is possible to tune the polarization and its sign by electrical means.