Charge detection in a bilayer graphene quantum dot

TL;DR

This paper demonstrates charge detection in a bilayer graphene quantum dot using a nearby nanoribbon charge detector, enabling detection of individual charging events even when Coulomb peaks are not observable.

Contribution

It introduces a novel charge detection method in bilayer graphene quantum dots using an integrated nanoribbon detector, expanding measurement capabilities.

Findings

Successful detection of individual charging events.

Detection method works even when Coulomb peaks are absent.

Local resonances enable charge sensing in challenging regimes.

Abstract

We show measurements on a bilayer graphene quantum dot with an integrated charge detector. The focus lies on enabling charge detection with a 30 nm wide bilayer graphene nanoribbon located approximately 35 nm next to a bilayer graphene quantum dot with an island diameter of about 100 nm. Local resonances in the nanoribbon can be successfully used to detect individual charging events in the dot even in regimes where the quantum dot Coulomb peaks cannot be measured by conventional techniques.