External field induced switching of tunneling current in the coupled quantum dots

TL;DR

This paper explores how external fields can induce rapid switching and bistability in tunneling currents within coupled quantum dots, highlighting the influence of Coulomb correlations and multi-electron states.

Contribution

It demonstrates the conditions under which external fields cause fast current switching and bistability in Coulomb-correlated coupled quantum dots, revealing the role of multi-electron states.

Findings

External field tuning induces fast tunneling current switching.

Negative tunneling conductivity observed under certain conditions.

Bistable tunneling current behavior identified in coupled quantum dots.

Abstract

We investigated the tunneling current peculiarities in the system of two coupled by means of the external field quantum dots (QDs) weakly connected to the electrodes in the presence of Coulomb correlations. It was found that tuning of the external field frequency induces fast multiple tunneling current switching and leads to the negative tunneling conductivity. Special role of multi-electrons states was demonstrated. Moreover we revealed conditions for bistable behavior of the tunneling current in the coupled QDs with Coulomb correlations.