Spatially resolving density-dependent screening around a single charged atom in graphene
Mesoscale and Nanoscale Physics
2017-05-18 v1
Abstract
Electrons in two-dimensional graphene sheets behave as interacting chiral Dirac fermions and have unique screening properties due to their symmetry and reduced dimensionality. By using a combination of scanning tunneling spectroscopy (STM/STS) measurements and theoretical modeling we have characterized how graphene's massless charge carriers screen individual charged calcium atoms. A back-gated graphene device configuration has allowed us to directly visualize how the screening length for this system can be tuned with carrier density. Our results provide insight into electron-impurity and electron-electron interactions in a relativistic setting with important consequences for other graphene-based electronic devices.
Cite
@article{arxiv.1705.06077,
title = {Spatially resolving density-dependent screening around a single charged atom in graphene},
author = {Dillon Wong and Fabiano Corsetti and Yang Wang and Victor W. Brar and Hsin-Zon Tsai and Qiong Wu and Roland K. Kawakami and Alex Zettl and Arash A. Mostofi and Johannes Lischner and Michael F. Crommie},
journal= {arXiv preprint arXiv:1705.06077},
year = {2017}
}
Comments
4 figures