Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

A. Deshpande, W. Bao, Z. Zhao, C. N. Lau, Brian J Leroy

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Using scanning tunneling microscopy (STM), we have imaged local charge density fluctuations in monolayer graphene. By placing a small gold nanoparticle on the end of the STM tip, a charge sensor is created. By raster scanning the tip over the surface and using Coulomb blockade spectroscopy, we map the local potential on the graphene. We observe a series of electron and hole doped puddles with a characteristic length scale of ∼20 nm. Theoretical calculations for the correlation length of the puddles based on the number of impurities are in agreement with our measurements.

Original languageEnglish (US)
Article number155409
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number15
DOIs
StatePublished - Apr 6 2011

Fingerprint

Coulomb blockade
Graphite
Scanning tunneling microscopy
Charge density
Graphene
scanning tunneling microscopy
graphene
Spectroscopy
raster scanning
Imaging techniques
Gold
spectroscopy
Monolayers
Impurities
gold
Nanoparticles
Scanning
impurities
nanoparticles
Electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy. / Deshpande, A.; Bao, W.; Zhao, Z.; Lau, C. N.; Leroy, Brian J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 15, 155409, 06.04.2011.

Research output: Contribution to journalArticle

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