On the possibility of level broadening in a quantum dot due to electrostatic interaction with a gate electrode

TL;DR

This paper investigates how Coulomb interactions with a nearby metallic gate can cause energy level broadening in a quantum dot, highlighting the impact of electrostatic coupling on quantum dot properties.

Contribution

It introduces a model analyzing Coulomb-induced level broadening in quantum dots due to electrostatic interaction with a 2D electron gas gate.

Findings

Coulomb scattering can lead to measurable level broadening in quantum dots.

Electrostatic interaction with a metallic gate influences quantum dot energy levels.

Theoretical framework for Coulomb-induced broadening effects is developed.

Abstract

In this article, we consider a quantum dot system which is interacting with a spatially separated metallic gate electrode via direct Coulomb interaction. Here, the gate electrode is described by an idealized two-dimensional electron gas. Due to Coulomb scattering effects, the latter may introduce level broadening to the quantum dot system.