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Related Concept Videos

Electron Behavior00:54

Electron Behavior

Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
Comparison Between Electrical And Gravitational Forces01:24

Comparison Between Electrical And Gravitational Forces

There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To compare the numerical strengths of the first two, take two particles of the same kind. Since electrons are fundamental particles, they are a good example.
Since both are inverse square law forces, the distance gets canceled when the ratio of the two forces is considered. Instead, the ratio of the electrical and gravitational forces depends on...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
Chemical Bonds02:40

Chemical Bonds


Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons from...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Electron Affinity03:07

Electron Affinity

The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).

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Related Experiment Video

Updated: May 18, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

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

Published on: July 24, 2015

Electron-electron interactions in artificial graphene.

E Räsänen1, C A Rozzi, S Pittalis

  • 1Nanoscience Center, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland. erasanen@jyu.fi

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Researchers explored electron-electron interactions in designer Dirac materials, specifically artificial graphene. This study reveals how these interactions impact the electronic band structure and the formation of Dirac points in these novel systems.

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

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Last Updated: May 18, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

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

Published on: July 24, 2015

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Recent advancements enable the creation and control of graphenelike systems, termed "designer Dirac materials".
  • Artificial graphene, a nanostructure with tunable quantum dots in a honeycomb lattice, mimics graphene's properties.
  • Understanding electron-electron interactions is crucial for accurately modeling artificial graphene's electronic behavior.

Purpose of the Study:

  • To theoretically investigate the influence of electron-electron interactions on the electronic properties of artificial graphene.
  • To analyze the effects on the band structure and the emergence of Dirac points.

Main Methods:

  • Theoretical modeling of electronic properties.
  • Analysis of band structure modifications due to interactions.

Main Results:

  • Electron-electron interactions significantly alter the band structure of artificial graphene.
  • These interactions affect the conditions under which Dirac points emerge.

Conclusions:

  • Accurate theoretical frameworks are essential for understanding designer Dirac materials.
  • Electron-electron interactions play a critical role in the electronic properties and potential applications of artificial graphene.