Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots

TL;DR

This paper theoretically explores electron transport in an Aharonov-Bohm interferometer with double quantum dots, focusing on how indirect coupling affects interference effects like Fano resonance and Aharonov-Bohm oscillations.

Contribution

It introduces the indirect coupling parameter $oldsymbol{ extalpha}$ to characterize reservoir-mediated coupling and analyzes its impact on transport and interference phenomena.

Findings

Strong coupling ($| extalpha|=1$) results in a single conduction mode.

Reduced $| extalpha|$ suppresses interference effects.

Linear conductance becomes flux-independent at $ extalpha=0$.

Abstract

We theoretically investigate electron transport through an Aharonov-Bohm interferometer containing laterally coupled double quantum dots. We introduce the indirect coupling parameter $\alpha$, which characterizes the strength of the coupling via the reservoirs between two quantum dots. $|\alpha|=1$ indicates the strongest coupling, where only a single mode contributes to the transport in the system. Two conduction modes exist in a system where $|\alpha|\neq 1$. The interference effects such as the Fano resonance and the Aharonov-Bohm oscillation are suppressed as the absolute value of the parameter $\alpha$ decreases from 1. The linear conductance does not depend on the flux when $\alpha=0$ since it corresponds to independent coupling of the dots to the reservoir modes.