Piezomagnetic Quantum Dots

TL;DR

This paper investigates how elliptical deformation in piezomagnetic quantum dots influences magnetic ordering, demonstrating controllable magnetization and potential for nanoscale magnetic switching.

Contribution

It introduces the concept of piezomagnetic quantum dots and shows how deformation controls magnetic properties without external magnetic fields.

Findings

Deformation induces piezomagnetic effects in quantum dots.

Magnetization can be tuned via gate voltage.

Reentrant magnetic ordering observed with deformation.

Abstract

We study the influence of deformations on magnetic ordering in quantum dots doped with magnetic impurities. The reduction of symmetry and the associated deformation from circular to elliptical quantum confinement lead to the formation of piezomagnetic quantum dots. The strength of elliptical deformation can be controlled by the gate voltage to change the magnitude of magnetization, at a fixed number of carriers and in the absence of applied magnetic field. We reveal a reentrant magnetic ordering with the increase of elliptical deformation and suggest that the piezomagnetic quantum dots can be used as nanoscale magnetic switches.