Tunneling transport through multi-electrons states in coupled quantum dots with Coulomb correlations

TL;DR

This paper explores how Coulomb correlations influence non-equilibrium charge states and tunneling conductivity in coupled quantum dots, revealing conditions for negative tunneling conductivity and occupation behavior.

Contribution

It provides new insights into Coulomb correlation effects on charge configurations and tunneling in coupled quantum dots under non-equilibrium conditions.

Findings

Total electron occupation can decrease with increasing bias due to Coulomb correlations.

Negative tunneling conductivity occurs in specific parameter ranges.

Coulomb correlations significantly alter charge transport behavior.

Abstract

We investigated the peculiarities of non-equilibrium charge configurations in the system of two strongly coupled quantum dots (QDs) weakly connected to the reservoirs in the presence of Coulomb correlations. We revealed that total electron occupation demonstrates in some cases significant decreasing with increasing of applied bias - contrary to the situation when Coulomb correlations are absent and found well pronounced ranges of system parameters where negative tunneling conductivity appears due to the Coulomb correlations.