Impurity Effects in Two-Electron Coupled Quantum Dots: Entanglement Modulation

TL;DR

This paper investigates how Coulomb impurities affect the electronic, optical, and entanglement properties of two-electron quantum dots with Gaussian confinement, revealing controllable entanglement modulation via impurity parameters.

Contribution

It introduces a detailed analysis of impurity effects on entanglement in quantum dots and proposes optical indicators for impurity detection and entanglement control.

Findings

Entanglement can be modulated by impurity location and charge.

Oscillator strength indicates impurity presence and influences entanglement.

Two regimes of low and high entanglement depend on impurity charge.

Abstract

We present a detailed analysis of the electronic and optical properties of two-electron quantum dots with a two-dimensional Gaussian confinement potential. We study the effects of Coulomb impurities and the possibility of manipulate the entanglement of the electrons by controlling the confinement potential parameters. The degree of entanglement becomes highly modulated by both the location and charge screening of the impurity atom, resulting two regimes: one of low entanglement and other of high entanglement, with both of them mainly determined by the magnitude of the charge. It is shown that the magnitude of the oscillator strength of the system could provide an indication of the presence and characteristics of impurities that could largely influence the degree of entanglement of the system.