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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Related Experiment Video

Updated: Jun 23, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Published on: July 24, 2015

Random-gap model for graphene and graphene bilayers.

K Ziegler1

  • 1Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany. Klaus.Ziegler@Physik.Uni-Augsburg.de

Physical Review Letters
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

Disorder in graphene, specifically a random staggered potential, can induce an insulating state. This transition to an insulating behavior was observed in both monolayer and bilayer graphene, with stronger effects in bilayers.

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties are sensitive to structural and potential variations.
  • Understanding disorder effects is crucial for electronic applications of graphene.

Purpose of the Study:

  • To investigate the impact of a randomly fluctuating gap on graphene's electronic properties.
  • To analyze the transition to an insulating state in monolayer and bilayer graphene.
  • To compare the influence of disorder between monolayer and bilayer graphene.

Main Methods:

  • Calculation of density of states.
  • Determination of one-particle scattering rate.
  • Analysis of transport properties (diffusion coefficient and conductivity) at the neutrality point.

Main Results:

  • Density of states, scattering rate, diffusion coefficient, and conductivity all vanish at a critical staggered potential.
  • A continuous transition to an insulating behavior is observed.
  • Disorder effects are significantly more pronounced in bilayer graphene compared to monolayer graphene.

Conclusions:

  • A random staggered potential drives graphene towards an insulating state.
  • The one-particle scattering rate is directly correlated with transport properties.
  • Bilayer graphene exhibits greater sensitivity to disorder than monolayer graphene.