Size effect of Ruderman-Kittel-Kasuya-Yosida interaction mediated by electrons in nanoribbons

TL;DR

This paper investigates how the size and geometry of nanoribbons influence the RKKY magnetic interaction mediated by electrons, revealing a strong dependence on width and impurity positions, which can be controlled via nanostructure design.

Contribution

It demonstrates that the RKKY interaction in nanoribbons is significantly affected by their width and impurity placement, highlighting the role of transverse electron confinement.

Findings

RKKY interaction varies with nanoribbon width

Transverse impurity position affects interaction strength

Size and geometry control RKKY interaction

Abstract

We calculated the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the magnetic impurities mediated by electrons in nanoribbons. It was shown that the RKKY interaction is strongly dependent on the width of the nanoribbon and the transverse positions of the impurities. The transverse confinement of electrons is responsible for the above size effect of the RKKY interaction. It provides a potential way to control the RKKY interaction by changing nanostructure geometry.