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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

396
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Intermediate Diffusive-Ballistic Electron Conduction Around Mesoscopic Defects in Graphene.

Toni Marković1, Wei Huang1, William S Huxter2

  • 1Department of Materials, ETH Zurich, Honggerbergring 64, 8093 Zurich, Switzerland.

ACS Nano
|March 20, 2025
PubMed
Summary
This summary is machine-generated.

Charge transport in graphene exhibits nondiffusive effects near defects. Ballistic contributions significantly impact electron transport even at mesoscopic scales, challenging purely diffusive models.

Keywords:
Landauer residual resistivity dipoleballistic transportdiffusive transportgraphenelattice Boltzmann simulationscanning tunneling microscopyscanning tunneling potentiometry

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Nondiffusive charge transport effects emerge when device dimensions approach the electronic mean free path.
  • Understanding these effects is crucial for nanoscale electronic devices.

Purpose of the Study:

  • To investigate electric transport phenomena around mesoscopic defects in graphene.
  • To differentiate between diffusive and ballistic contributions to charge scattering.

Main Methods:

  • Utilized scanning tunneling potentiometry to map nanoscale topography and local electrochemical potential.
  • Employed lattice-Boltzmann simulations for modeling transport regimes.

Main Results:

  • Observed transport in an intermediate regime between diffusive and ballistic limits.
  • Diffusive models significantly underestimate the electrochemical potential around defects.
  • Ballistic contributions to electron transport are significant at mesoscopic scales, increasing as feature sizes decrease.

Conclusions:

  • Graphene's charge transport near defects is not purely diffusive.
  • The ratio of defect size to mean free path is critical in the intermediate transport regime.
  • Ballistic transport plays a substantial role in mesoscopic graphene devices.