Channel Blockade in a Two-Path Triple-Quantum-Dot System

TL;DR

This paper investigates electron transport in a two-path triple-quantum-dot system, revealing channel blockade caused by inter-channel Coulomb interaction, supported by experimental data and a theoretical model.

Contribution

It introduces a method to separate conductance in a two-path triple-dot system and demonstrates the observation of channel blockade due to Coulomb interactions, combining experimental and theoretical analysis.

Findings

Observation of channel blockade due to Coulomb interaction

Separation of conductance in two-path triple-dot system

Theoretical model explaining transport dynamics

Abstract

Electronic transport through a two-path triple-quantum-dot system with two source leads and one drain is studied. By separating the conductance of the two double dot paths, we are able to observe double dot and triple dot physics in transport and study the interaction between the paths. We observe channel blockade as a result of inter-channel Coulomb interaction. The experimental results are understood with the help of a theoretical model which calculates the parameters of the system, the stability regions of each state and the full dynamical transport in the triple dot resonances.