Effect of inhomogeneous magnetic flux on double-dot Aharonov-Bohm Interferometer

TL;DR

This paper investigates how inhomogeneous magnetic flux distribution affects quantum transport in a double quantum dot Aharonov-Bohm interferometer, revealing tunable conductance and density of states via flux imbalance.

Contribution

It demonstrates that magnetic flux imbalance can control tunneling coupling and transport properties in double-dot AB interferometers, highlighting the importance of flux distribution control.

Findings

Conductance and local densities of states are periodic functions of flux imbalance.

Magnetic flux imbalance can tune the effective tunneling coupling.

Transport signals are manipulable by adjusting flux imbalance.

Abstract

The influence of the inhomogeneous distribution of the magnetic flux on quantum transport through coupled double quantum dots embedded in an Aharonov-Bohm interferometer are investigated. We show that the effective tunnelling coupling between two dots can be tuned by the magnetic flux imbalance threading two AB subrings. Thus the conductance and the local densities of states become periodic functions of the magnetic flux imbalance. Therefore, transport signals can be manipulated by adjusting the magnetic flux imbalance. Thus accurate control of the distribution of the magnetic flux is necessary for any practical application of such an Aharonov-Bohm interferometer.