Entanglement in S states of two-electron quantum dots with Coulomb impurities at the center

TL;DR

This paper investigates how Coulomb impurities influence entanglement in two-electron quantum dots, revealing significant effects in weak confinement regimes through detailed entropy analysis.

Contribution

It provides a detailed analysis of entanglement dependence on system parameters for quantum dots with impurities, highlighting the impurity's impact in weak confinement.

Findings

Entanglement varies significantly with impurity presence.

Weak confinement enhances impurity effects on entanglement.

Ground and triplet S states show distinct entropy behaviors.

Abstract

We study a system of two Coulombically interacting electrons in an external harmonic potential in the presence of an on-centre Coulomb impurity. Detailed results for the dependencies of the reduced von Neumann entropy on the control parameters of the system are provided for both the ground state and the triplet S states with the lowest energy. Among other features, it is found that in the weak confinement regime the entanglement is strongly affected by the presence of an acceptor impurity.