Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

Details Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

2010-12-02

arxiv.org/abs/1012.0374v2

Phys. Rev. B 83, 155409 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.83.155409

Using scanning tunneling microscopy, 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 charge on the graphene. We observe a series of electron and hole doped puddles with a characteristic length scale of about 20 nm. Theoretical calculations for the correlation length of the puddles based on the number of impurities are in agreement with our measurements.

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