Tunable Molecular Resonances of Double Quantum Dots Embedded in an Aharonov-Bohm Interferometer

TL;DR

This paper studies how molecular resonances in double quantum dots within an Aharonov-Bohm interferometer can be tuned and identified through conductance measurements, revealing sensitive phase-dependent behaviors.

Contribution

It introduces a model predicting Breit-Wigner and Fano resonances in conductance, showing their dependence on Aharonov-Bohm phase and bonding types in double quantum dots.

Findings

Resonances consist of Breit-Wigner and Fano types.

Resonance widths and Fano factors depend sensitively on AB phase.

Bonding properties can be distinguished via AB oscillations.

Abstract

We investigate resonant tunneling through molecular states of coupled double quantum dots embedded in an Aharonov-Bohm (AB) interferometer. The conductance through the system consists of two resonances associated with the bonding and the antibonding quantum states. We predict that the two resonances are composed of a Breit-Wigner resonance and a Fano resonance, those widths and Fano factor depending on the AB phase very sensitively. Further, we point out that the bonding properties, such as the covalent and the ionic bonding, can be identified by the AB oscillations.