Interfacial confinement in core-shell nanowires due to high dielectric mismatch

TL;DR

This paper theoretically explores how dielectric mismatch in core-shell nanowires causes interfacial confinement, significantly affecting electronic properties and challenging ideal confinement models.

Contribution

It introduces a theoretical model showing the impact of dielectric mismatch on charge confinement and electronic properties in core-shell nanowires.

Findings

Dielectric mismatch causes charge carriers to localize at the interface.

Interfacial confinement alters energy levels and recombination energies.

Magnetic field response is affected by dielectric mismatch.

Abstract

We theoretically investigate the role of the dielectric mismatch between materials on the energy levels and recombination energies of a core-shell nanowire. Our results demonstrate that when the dielectric constant of the core material is lower than that of the shell material, the self-image potential pushes the charge carriers towards the core-shell interface, in such a way that the ideal confinement model is no longer suitable. The effects of this interfacial confinement on the electronic properties of such wires, as well as on its response to applied magnetic fields, are discussed.