Gate-controlled conductance through bilayer graphene ribbons

TL;DR

This paper investigates how applying an external bias to a bilayer graphene flake with monolayer nanoribbon contacts can control its conductance, revealing tunable electronic transmission properties.

Contribution

It demonstrates the ability to modulate conductance in bilayer graphene using bias and contact positioning, introducing a method for electronic control in graphene-based devices.

Findings

Conductance depends strongly on applied bias and contact position.

Bias can open an energy gap in the bilayer graphene.

Electronic transmission can be externally tuned via bias.

Abstract

We study the conductance of a biased bilayer graphene flake with monolayer nanoribbon contacts. We find that the transmission through the bilayer ribbon strongly depends on the applied bias between the two layers and on the relative position of the monolayer contacts. Besides the opening of an energy gap on the bilayer, the bias allows to tune the electronic density on the bilayer flake, making possible the control of the electronic transmission by an external parameter.