Electronic properties of quantum dots formed by magnetic double barriers in quantum wires

TL;DR

This paper models electron transport through quantum wires with magnetic double barriers, demonstrating the formation of tunable quantum dots and analyzing their resonance behaviors in different transport regimes.

Contribution

It introduces a novel method to form and control quantum dots using magnetic barriers in quantum wires, with detailed analysis of resonance phenomena.

Findings

Quantum dots can be formed by magnetic barriers in quantum wires.

Resonance types depend on the number of open transmission channels.

The confinement potential of the quantum dots can be tuned experimentally.

Abstract

The transport through a quantum wire exposed to two magnetic spikes in series is modeled. We demonstrate that quantum dots can be formed this way which couple to the leads via magnetic barriers. Conceptually, all quantum dot states are accessible by transport experiments. The simulations show Breit-Wigner resonances in the closed regime, while Fano resonances appear as soon as one open transmission channel is present. The system allows to tune the dot's confinement potential from sub-parabolic to superparabolic by experimentally accessible parameters.