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

• Tunneling transitions between multi-electronic states in coupled QDs were analyzed in terms of pseudo-particle operators.
• We found that QD׳s total electron occupation can significantly decrease with increasing of applied bias voltage.
• We revealed the appearance of negative tunneling conductivity caused by the presence of Coulomb correlations.
• We demonstrated that correlated QDs can be used as effective current switch keys.

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.