Nonlinear Transport through Coupled Double Quantum Dot Systems

TL;DR

This paper studies electron transport in double quantum dots using a combined microscopic and correlation model, successfully explaining experimental Coulomb blockade oscillations across different coupling regimes.

Contribution

It introduces a nonperturbative approach that integrates quantum confinement and correlation effects to analyze transport in double quantum dots.

Findings

Qualitative agreement with experimental Coulomb blockade oscillations

Effective modeling across weak to strong interdot coupling regimes

Nonperturbative calculation of tunneling behavior

Abstract

We investigate sequential tunneling transport through a semiconductor double quantum dot structure by combining a simple microscopic quantum confinement model with a Mott-Hubbard type correlation model. We calculate nonperturbatively the evolution of the Coulomb blockade oscillations as a function of the interdot barrier conductance, obtaining good qualitative agreement with the experimental data over the whole tunneling regime from the weak-coupling individual dot to the strong-coupling coherent double-dot molecular system.