# Tip induced doping effects in local tunnel spectra of graphene

Source: [Tip induced doping effects in local tunnel spectra of graphene](<https://www.sota2.com/research/paper/68fa2d171e209131ce8563fa>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T15:45:25.441Z

Authors: Shyam K. Choudhury, Anjan K. Gupta

Published: 2010-08-21T06:23:43.000Z

## Abstract

We report on tip induced doping in local tunnel spectra of single layer graphene (SLG) with tunable back-gate using room temperature scanning tunneling microscopy and spectroscopy (STM/S). The SLG samples, prepared on silicon dioxide surface by exfoliation method and verified by Raman spectra, show atomically resolved honeycomb lattice. Local tunnel spectra show two minima with a clear evolution in the position of both with doping by the back gate. A similar variation in spectra is also observed spatially due to charge inhomogeneity. With doping the two minima move in opposite directions with one showing nearly a square root dependence and the other a linear dependence on gate voltage. We explain these features as arising from the STM tip induced and bias voltage dependent doping in SLG.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1008.3606>)

[PDF](<https://arxiv.org/pdf/1008.3606.pdf>)