Tunable quantum dots in monolayer graphene

TL;DR

This paper explores a tunable graphene quantum dot created by combined electric and magnetic fields, demonstrating control over quantum states for potential quantum device applications.

Contribution

It introduces a novel method to form and tune graphene quantum dots using combined electric and magnetic fields, highlighting their potential for quantum device design.

Findings

Quantum dot states peak in different regions due to Klein tunneling.

External fields enable coupling between different dot states.

Moderate fields allow effective tunability of the quantum dot.

Abstract

We examine a graphene quantum dot formed by combining an electric and a uniform magnetic field. The electric field creates a smooth quantum well potential while the magnetic field induces an exponential tail to the dot states. The states peak in the well and the electrostatic barrier region as a result of the Klein tunneling effect. Coupling between dot states which peak in different regions can be achieved with the electric and magnetic fields. The tunability of this dot with moderate external fields could be used for designing quantum devices in monolayer graphene.