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Charge Puddles in Graphene Near the Dirac Point
- Source :
- Phys. Rev. Lett. 116, 126804 (2016)
- Publication Year :
- 2015
-
Abstract
- The charge carrier density in graphene on a dielectric substrate such as SiO$_2$ displays inhomogeneities, the so-called charge puddles. Because of the linear dispersion relation in monolayer graphene, the puddles are predicted to grow near charge neutrality, a markedly distinct property from conventional two-dimensional electron gases. By performing scanning tunneling microscopy/spectroscopy on a mesoscopic graphene device, we directly observe the puddles' growth, both in spatial extent and in amplitude, as the Dirac point is approached. Self-consistent screening theory provides a unified description of both the macroscopic transport properties and the microscopically observed charge disorder.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 116, 126804 (2016)
- Publication Type :
- Report
- Accession number :
- edsarx.1512.05304
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.116.126804