Gate-controlled transmission of quantum Hall edge states in bilayer graphene

TL;DR

This paper demonstrates the ability to controllably tune the transmission of quantum Hall edge states in bilayer graphene using an independent gate, enabling precise manipulation of edge modes for advanced quantum experiments.

Contribution

It introduces a method to continuously control the backscattering rate of edge states in bilayer graphene via gating, a novel approach for quantum Hall edge state manipulation.

Findings

Backscattering rate tuned from 0 to near 1

Fractional quantized backscattering values observed

Feasibility shown for manipulating edge states

Abstract

The edge states of the quantum Hall and fractional quantum Hall effect of a two-dimensional electron gas provide key access to the excitations of the bulk. Here we demonstrate controlled transmission of edge states in bilayer graphene. Controlled by an independent gate, the backscattering rate of the edge modes is continuously tuned from 0 to close to 1, with fractional quantized values corresponding to the sequential complete backscattering of individual modes. Our experiments demonstrate the feasibility to controllably manipulate edge states in bilayer graphene, thus opening the door to more complex experiments.