Near-threshold properties of the electronic density of layered quantum-dots

TL;DR

This paper explores how the near-threshold properties of one-body potentials in layered quantum dots can be used to manipulate electron wave functions, with potential applications in quantum-dot technologies.

Contribution

It introduces a method to control electron wave functions in layered quantum dots through a simple global parameter affecting near-threshold properties.

Findings

Wave function spatial extent can be manipulated by potential parameters.

Near-threshold phenomena are observable with effective mass approximation models.

Potential for implementation in current quantum-dot quantum well technologies.

Abstract

We present a way to manipulate an electron trapped in a layered quantum dot based on near-threshold properties of one-body potentials. We show that potentials with a simple global parameter allows the manipulation of the wave function changing its spatial extent. This phenomenon seems to be fairly general and could be implemented using current quantum-dot quantum wells technologies and materials if a proper layered quantum dot is designed. The layered quantum dot under consideration is similar to a quantum-dot quantum well device, i.e. consists of a spherical core surrounded by successive layers of different materials. The number of layers and the constituent material are chosen to highlight the near-threshold properties. In particular we show that the near-threshold phenomena can be observed using an effective mass approximation model that describes the layered quantum dot which is consistent with actual experimental parameters.