Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

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

Research output: Contribution to journalArticle

38 Scopus citations

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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