Charge dynamics effects in conductance through a large semi-open quantum dot

TL;DR

This paper investigates how charge accumulation affects Fano resonance lineshapes in quantum dot conductance, providing a microscopic model that aligns with recent experimental observations.

Contribution

It introduces a microscopic Hamiltonian-based model to describe charge dynamics effects on Fano lineshapes in quantum dot conductance.

Findings

Charge accumulation modifies the Fano q parameter.

The model explains experimental charge sensing results.

Resonant conduction is quantitatively described.

Abstract

Fano lineshapes in resonant transmission in a quantum dot imply interference between localized and extended states. The influence of the charge accumulated at the localized levels, which screens the external gate voltage acting on the conduction channel is investigated. The modified Fano q parameter and the resonant conduction is derived starting from a microscopic Hamiltonian. The latest experiments on "charge sensing" and ``Coulomb modified Fano sensing `` compare well with the results of the present model.