Localized magnetic states in Rashba dots

TL;DR

This paper investigates how localized magnetic moments form in Rashba quantum dots within electron wires, revealing that Rashba spin-orbit interaction influences magnetization and can stabilize magnetic phases under bias.

Contribution

It introduces an Anderson-like model for Rashba dots and analyzes the impact of Rashba coupling on local magnetization in both equilibrium and nonequilibrium conditions.

Findings

Magnetization depends nontrivially on Rashba coupling strength.

A stable magnetic phase persists at large bias due to Rashba interaction.

Rashba spin-orbit interaction can induce and control local magnetic moments.

Abstract

We study the formation of local moments in quantum dots arising in quasi-one dimensional electron wires due to localized spin-orbit (Rashba) interaction. Using an Anderson-like model to describe the occurrence of the magnetic moments in these Rashba dots, we calculate the local magnetization within the mean-field approximation. We find that the magnetization becomes a nontrivial function of the Rashba coupling strength. We discuss both the equilibrium and nonequilibrium cases. Interestingly, we obtain a magnetic phase which is stable at large bias due to the Rashba interaction.