# Imaging backscattering in graphene quantum point contacts

## TL;DR

This paper investigates how a scanning probe can image backscattering phenomena in graphene quantum point contacts, revealing interference effects despite Klein tunneling, through advanced computational simulations.

## Contribution

It introduces a new computational method to simulate infinite graphene planes and demonstrates backscattering imaging in graphene QPCs using this approach.

## Key findings

- Backscattering interference is visible in conductance maps.
- Klein tunneling does not prevent imaging of backscattering.
- The method applies to both single-layer and bilayer graphene QPCs.

## Abstract

We study graphene quantum point contacts (QPC) and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We consider both etched single-layer QPCs as well as the ones formed by bilayer patches deposited at the sides of the monolayer conducting channel using an atomistic tight binding approach. A computational method is developed to effectively simulate an infinite graphene plane outside the QPC using a computational box of a finite size. We demonstrate that in spite of the Klein phenomenon interference due to the backscattering at a circular n-p junction induced by the probe potential is visible in spatial maps of conductance as functions of the probe position.