# Scanning Tunneling Microscopy and Spectroscopy study of charge inhomogeneities in bilayer Graphene

Source: [Scanning Tunneling Microscopy and Spectroscopy study of charge inhomogeneities in bilayer Graphene](<https://www.sota2.com/research/paper/68fa2d171e209131ce8563ef>)

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

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

Authors: Shyam K. Choudhary, Anjan K. Gupta

Published: 2010-07-26T10:33:59.000Z

## Abstract

We report room temperature scanning tunneling microscopy and spectroscopy study of bilayer graphene prepared by mechanical exfoliation on SiO$\_2$/Si surface and electrically contacted with gold pads using a mechanical mask. The bulk conductivity shows contribution from regions of varying electron density indicating significant charge inhomogeneity. Large scale topographic images show ripple like structures with a roughness of $\\sim$1nm while the small scale atomic resolution images show graphite-like triangular lattice. Local dI/dV-V tunnel spectra have an asymmetric V-shape with the minima location showing significant spatial variation indicating inhomogeneity in electron density of order 10$^{11}$ cm-2. The minima in spectra at a fixed location also shifts linearly with the gate voltage with a slope consistent with the field induced carrier density.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1007.4417>)

[PDF](<https://arxiv.org/pdf/1007.4417.pdf>)