Electron flow in split-gated bilayer graphene

TL;DR

This study demonstrates control over electron flow in bilayer graphene using electrostatic gates, revealing interference effects in split-gate configurations that enable precise electron pathway manipulation.

Contribution

It introduces a method to steer electron flow in bilayer graphene via electrostatic gating, highlighting interference effects in split-gate structures.

Findings

Electron flow can be directed using electrostatic gates.

Interference effects are observed in split-gate geometries.

Transport features depend on gate geometry.

Abstract

We present transport measurements on a bilayer graphene sheet with homogeneous back gate and split top gate. The electronic transport data indicates the capability to direct electron flow through graphene nanostructures purely defined by electrostatic gating. By comparing the transconductance data recorded for different top gate geometries - continuous barrier and split-gate - the observed transport features for the split-gate can be attributed to interference effects inside the narrow opening.