Magnetic-flux-controlled giant Fano factor for the coherent tunneling through a parallel double-quantum-dot

TL;DR

This paper investigates how magnetic flux can control giant Fano factors in shot noise during electron tunneling through a parallel double-quantum-dot system, highlighting the interplay of quantum interference and Coulomb repulsion.

Contribution

It introduces a method to control shot noise via magnetic flux in a double-quantum-dot interferometer, revealing a giant Fano factor caused by quantum interference and Coulomb effects.

Findings

Giant Fano factor can be achieved and controlled by magnetic flux.

Quantum interference significantly influences shot noise.

Strong Coulomb repulsion enhances noise effects.

Abstract

We report our studies of zero-frequency shot noise in tunneling through a parallel-coupled quantum dot interferometer by employing number-resolved quantum rate equations. We show that the combination of quantum interference effect between two pathways and strong Coulomb repulsion could result in a giant Fano factor, which is controllable by tuning the enclosed magnetic flux.