Coulomb-induced dynamic correlations in a double nanosystem

TL;DR

This paper investigates how Coulomb interactions influence time-dependent electron transport in a double quantum dot system, revealing charge redistribution effects and transient charge sensing phenomena.

Contribution

It introduces a detailed analysis of Coulomb-induced correlations in a double nanosystem using exact diagonalization within a time-dependent transport framework.

Findings

Transport can be suppressed or enhanced depending on bias tuning.

Charge redistribution on many-body states explains steady-state behavior.

Transient mutual charge sensing between dots is demonstrated.

Abstract

Time-dependent transport through two capacitively coupled quantum dots is studied in the framework of the generalized master equation. The Coulomb interaction is included within the exact diagonalization method. Each dot is connected to two leads at different times, such that a steady state is established in one dot before the coupling of the other dot to its leads. By appropriately tuning the bias windows on each dot we find that in the final steady state the transport may be suppressed or enhanced. These two cases are explained by the redistribution of charge on the many-body states built on both dots. We also predict and analyze the transient mutual charge sensing of the dots.