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Spatially resolving density-dependent screening around a single charged atom in graphene

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Title: Spatially resolving density-dependent screening around a single charged atom in graphene
Authors: Wong, D
Corsetti, F
Wang, Y
Brar, VW
Tsai, H-Z
Wu, Q
Kawakami, RK
Zettl, A
Mostofi, AA
Lischner, J
Crommie, MF
Item Type: Journal Article
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 measurements and theoretical modeling we have characterized how graphene's massless charge carriers screen individual charged calcium atoms. A backgated 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.
Issue Date: 16-May-2017
Date of Acceptance: 1-May-2017
URI: http://hdl.handle.net/10044/1/45892
DOI: https://dx.doi.org/10.1103/PhysRevB.95.205419
ISSN: 2469-9950
Publisher: American Physical Society
Journal / Book Title: Physical Review B
Volume: 95
Issue: 20
Copyright Statement: © 2017 American Physical Society. Phys. Rev. B 95, 205419 – Published 16 May 2017
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N005244/1
Publication Status: Published
Article Number: 205419
Appears in Collections:Materials
Faculty of Engineering