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.
@article{arxiv.1704.08460,
title = {Imaging backscattering in graphene quantum point contacts},
author = {Alina Mreńca-Kolasińska and Bartłomiej Szafran},
journal= {arXiv preprint arXiv:1704.08460},
year = {2017}
}