Imaging local electronic corrugations and doped regions in graphene.

Abstract:

:Electronic structure heterogeneities are ubiquitous in two-dimensional graphene and profoundly impact the transport properties of this material. Here we show the mapping of discrete electronic domains within a single graphene sheet using scanning transmission X-ray microscopy in conjunction with ab initio density functional theory calculations. Scanning transmission X-ray microscopy imaging provides a wealth of detail regarding the extent to which the unoccupied levels of graphene are modified by corrugation, doping and adventitious impurities, as a result of synthesis and processing. Local electronic corrugations, visualized as distortions of the π*cloud, have been imaged alongside inhomogeneously doped regions characterized by distinctive spectral signatures of altered unoccupied density of states. The combination of density functional theory calculations, scanning transmission X-ray microscopy imaging, and in situ near-edge X-ray absorption fine structure spectroscopy experiments also provide resolution of a longstanding debate in the literature regarding the spectral assignments of pre-edge and interlayer states.

journal_name

Nat Commun

journal_title

Nature communications

authors

Schultz BJ,Patridge CJ,Lee V,Jaye C,Lysaght PS,Smith C,Barnett J,Fischer DA,Prendergast D,Banerjee S

doi

10.1038/ncomms1376

subject

Has Abstract

pub_date

2011-06-28 00:00:00

pages

372

issn

2041-1723

pii

ncomms1376

journal_volume

2

pub_type

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