Quantum interference and electron correlation in charge transport through triangular quantum dot molecules

TL;DR

This study investigates charge transport in triangular quantum dot molecules, revealing quantum interference effects, many-body phenomena, and robustness of destructive interference, with results aligning well with experimental data.

Contribution

It provides a comprehensive analysis of quantum interference and electron correlation effects in TQDM, including the first detailed spectra and stability diagrams matching experiments.

Findings

Quantum interference causes significant effects in TQDM conductance.

Charge stability diagrams match recent experimental results.

Destructive quantum interference remains robust at higher temperatures.

Abstract

We study the charge transport properties of triangular quantum dot molecule (TQDM) connected to metallic electrodes, taking into account all correlation functions and relevant charging states. The quantum interference (QI) effect of TQDM resulting from electron coherent tunneling between quantum dots is revealed and well interpreted by the long distance coherent tunneling mechanism. The spectra of electrical conductance of TQDM with charge filling from one to six electrons clearly depict the many-body and topological effects. The calculated charge stability diagram for conductance and total occupation numbers match well with the recent experimental measurements. We also demonstrate that the destructive QI effect on the tunneling current of TQDM is robust with respect to temperature variation, making the single electron QI transistor feasible at higher temperatures.