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Related Experiment Video

Updated: May 17, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
07:51

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Enhanced screening in chemically functionalized graphene.

Shengjun Yuan1, T O Wehling, A I Lichtenstein

  • 1Radboud University of Nijmegen, Institute for Molecules and Materials, Nijmegen, The Netherlands. s.yuan@science.ru.nl

Physical Review Letters
|October 30, 2012
PubMed
Summary

Hydrogen adatoms in graphene create midgap states, enhancing the electronic density of states. This leads to suppressed screening beyond a critical length scale, a phenomenon measurable via electron energy loss spectroscopy.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Resonant scatterers, like hydrogen adatoms, significantly influence the electronic properties of graphene.
  • Low-energy density of states in graphene can be strongly enhanced by specific impurities.

Purpose of the Study:

  • Investigate the impact of resonant scatterers (hydrogen adatoms) on the electronic screening in graphene.
  • Characterize the behavior of the dielectric function and polarization function in the presence of these impurities.

Main Methods:

  • Utilized Kubo formula calculations to analyze the dielectric function (ε).
  • Examined the dynamic polarization function.
  • Proposed electron energy loss spectroscopy as a direct measurement technique.

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Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy
10:12

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

Published on: September 21, 2020

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Last Updated: May 17, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
07:51

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Graphene Enclosure of Chemically Fixed Mammalian Cells for Liquid-Phase Electron Microscopy
10:12

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

Published on: September 21, 2020

Main Results:

  • Observed an increase in the dielectric function (ε) due to the creation of midgap states.
  • Found no metallic divergence in the static dielectric function at small momentum transfer (q→0).
  • Identified a new length scale, l(c), associated with suppressed screening, linked to Anderson localization length.

Conclusions:

  • Hydrogen adatoms induce a 'bad metal' behavior in graphene's electronic screening.
  • The Anderson localization length defines a critical scale for screening suppression in this system.