Anisotropic Heisenberg form of RKKY interaction in the one-dimensional spin-polarized electron gas

TL;DR

This paper derives explicit expressions for the anisotropic RKKY interaction in a one-dimensional spin-polarized electron gas, revealing its oscillatory behavior and anisotropic Heisenberg form due to broken time-reversal symmetry.

Contribution

It provides a detailed analytical study of the anisotropic RKKY interaction in 1D spin-polarized systems, extending known results to include anisotropy and broken symmetry effects.

Findings

Interaction exhibits oscillatory behavior as a function of distance R.

The RKKY interaction can be expressed in an anisotropic Heisenberg form.

Broken time-reversal symmetry leads to anisotropic exchange terms.

Abstract

We study the indirect exchange interaction between two localized magnetic moments, known as Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, in a one-dimensional spin-polarized electron gas. We find explicit expressions for each term of this interaction, study their oscillatory behaviors as a function of the distance between two magnetic moments, $R$, and compare them with the known results for RKKY interaction in the case of one-dimensional standard electron gas. We show this interaction can be written in an anisotropic Heisenberg form, $E(\vec R)=\lambda^2\chi_{xx}(S_{1x}S_{2x}+S_{1y}S_{2y})+\lambda^2\chi_{zz}\, S_{1z}S_{2z}$, coming from broken time-reversal symmetry of the host material.