Spatial mapping of the Dirac point in monolayer and bilayer graphene

Aparna Deshpande, Wenzhong Bao, Zeng Zhao, Chun Ning Lau, Brian J Leroy

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have mapped the Dirac point in exfoliated monolayer and bilayer graphene using spatially resolved scanning tunneling spectroscopy measurements at low temperature. The Dirac-point shifts in energy at different locations in graphene. However, a cross correlation with the topography shows no correlation indicating that topographic features, such as ripples are not the primary source of the variation. Rather, we attribute the shift of the Dirac point to random charged impurities located near the graphene. Our findings emphasize the need to advance exfoliated graphene sample preparation to minimize the effect of impurities.

Original languageEnglish (US)
Article number5504843
Pages (from-to)88-91
Number of pages4
JournalIEEE Transactions on Nanotechnology
Volume10
Issue number1
DOIs
StatePublished - Jan 2011

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Graphene
Monolayers
Impurities
Topography
Spectroscopy
Scanning
Temperature

Keywords

  • Dirac point
  • graphene
  • scanning tunneling microscope (STM)
  • spectroscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications

Cite this

Spatial mapping of the Dirac point in monolayer and bilayer graphene. / Deshpande, Aparna; Bao, Wenzhong; Zhao, Zeng; Lau, Chun Ning; Leroy, Brian J.

In: IEEE Transactions on Nanotechnology, Vol. 10, No. 1, 5504843, 01.2011, p. 88-91.

Research output: Contribution to journalArticle

Deshpande, Aparna ; Bao, Wenzhong ; Zhao, Zeng ; Lau, Chun Ning ; Leroy, Brian J. / Spatial mapping of the Dirac point in monolayer and bilayer graphene. In: IEEE Transactions on Nanotechnology. 2011 ; Vol. 10, No. 1. pp. 88-91.
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