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Related Experiment Video

Updated: May 26, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Correlated charged impurity scattering in graphene.

Jun Yan¹, Michael S Fuhrer

¹Center for Nanophysics and Advanced Materials, University of Maryland, College Park, 20742, USA.

Physical Review Letters

|December 21, 2011

Summary

Electron transport in graphene is influenced by charged impurities. Temperature affects impurity correlation length, impacting sample mobility and conductivity, as explained by recent theories.

Area of Science:

Condensed Matter Physics
Materials Science

Background:

Graphene exhibits unique electron transport properties.
Charged impurities significantly affect carrier mobility in graphene.
The role of impurity correlations in graphene conductivity is not fully understood.

Purpose of the Study:

To investigate electron transport in graphene with correlated charged impurities.
To understand the influence of temperature on impurity correlations and mobility.
To explain the sublinear carrier-density dependence of conductivity in graphene.

Main Methods:

Adsorption and thermal annealing of potassium atoms on graphene.
Experimental measurement of electron transport properties.
Comparison of experimental data with theoretical models.

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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy

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Last Updated: May 26, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy

Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy

Published on: September 21, 2020

Main Results:

Sample mobility is dependent on temperature, which dictates the correlation length of charged impurities.
A recent theory quantitatively explains the temperature dependence of the correlation length.
Impurity correlations provide a consistent explanation for the sublinear carrier-density dependence of conductivity.

Conclusions:

Temperature-dependent impurity correlations are crucial for understanding graphene's electron transport.
The findings offer a unified explanation for previously puzzling conductivity behaviors in graphene.
This study advances the theoretical understanding of scattering mechanisms in 2D materials.