Charge and spin configurations in the coupled quantum dots with Coulomb correlations induced by tunneling current

TL;DR

This paper explores how Coulomb correlations influence charge and spin states in coupled quantum dots under non-equilibrium conditions, revealing conditions where negative tunneling conductivity occurs.

Contribution

It provides a detailed analysis of charge and spin configurations in coupled quantum dots with Coulomb correlations, highlighting the emergence of negative tunneling conductivity.

Findings

Identification of parameter ranges with negative tunneling conductivity

Modification of charge states under non-equilibrium conditions

Alteration of spin configurations due to Coulomb correlations

Abstract

We investigated the peculiarities of non-equilibrium charge states and spin configurations in the system of two strongly coupled quantum dots (QDs) weakly connected to the electrodes in the presence of Coulomb correlations. We analyzed the modification of non-equilibrium charge states and different spin configurations of the system in a wide range of applied bias voltage and revealed well pronounced ranges of system parameters where negative tunneling conductivity appears due to the Coulomb correlations.