Electronic transport through a quantum dot network

TL;DR

This paper investigates how conductance in a quantum dot network varies with inter-dot coupling, revealing a transition from antidot to tight binding regimes, and highlights the role of Coulomb blockade and magnetoresistance effects.

Contribution

It introduces a comprehensive analysis of conductance transitions in quantum dot networks and compares experimental results with theoretical models of magnetotunneling.

Findings

Transition from antidot to tight binding regime with decreasing coupling

Identification of Coulomb blockade effects and charging energy variations

Observation of negative magnetoresistance consistent with theoretical predictions

Abstract

The conductance through a finite quantum dot network is studied as a function of inter-dot coupling. As the coupling is reduced, the system undergoes a transition from the antidot regime to the tight binding limit, where Coulomb resonances with on average increasing charging energies are observed. Percolation models are used to describe the conduction in the open and closed regime and contributions from different blockaded regions can be identified. A strong negative average magnetoresistance in the Coulomb blockade regime is in good quantitative agreement with theoretical predictions for magnetotunneling between individual quantum dots.