Wave function engineering in quantum dot-ring nanostructures

TL;DR

This paper explores how the electron wave functions in a quantum dot-ring nanostructure can be engineered through potential modifications, enabling control over its optical, coherent, and conductive properties.

Contribution

It demonstrates the ability to manipulate wave function localization and properties of the nanostructure via electrical gating, highlighting a new method for property control.

Findings

Wave functions can be localized in different parts of the structure.

Small changes in potential drastically alter properties.

Electrical gating enables precise control of nanostructure behavior.

Abstract

Modern nanotechnology allows producing, depending on application, various quantum nanostructures with the desired properties. These properties are strongly influenced by the confinement potential which can be modified, e.g., by electrical gating. In this paper we analyze a nanostructure composed of a quantum dot surrounded by a quantum ring. We show that depending on the details of the confining potential the electron wave functions can be located in different parts of the structure. Since the properties of such a nanostructure strongly depend on the distribution of the wave functions, varying the applied gate voltage one can easily control them. In particular, we illustrate the high controllability of the nanostructure by demonstrating how its coherent, optical, and conducting properties can be drastically changed by a small modification of the confining potential.