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Van der Waals Interactions01:24

Van der Waals Interactions

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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.
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Van der Waals Equation01:10

Van der Waals Equation

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
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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.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.2K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
1.2K
Semiconductors01:22

Semiconductors

1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Updated: Mar 17, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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2D materials and van der Waals heterostructures.

K S Novoselov1, A Mishchenko2, A Carvalho3

  • 1School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK. National Graphene Institute, University of Manchester, Manchester M13 9PL, UK. kostya@manchester.ac.uk phycastr@nus.edu.sg.

Science (New York, N.Y.)
|July 30, 2016
PubMed
Summary
This summary is machine-generated.

The rapid advancement of two-dimensional (2D) materials enables unique 2D physics and novel heterostructure devices. This review explores 2D crystal properties and their applications in emerging electronic and optoelectronic technologies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • The field of two-dimensional (2D) materials and their heterostructures is rapidly evolving.
  • These materials exhibit unique physical phenomena not observed in bulk counterparts.
  • Emerging heterostructure devices leverage these 2D properties for novel functionalities.

Purpose of the Study:

  • To review the fundamental properties of novel 2D crystals.
  • To examine the application of these properties in new heterostructure devices.
  • To highlight the potential of 2D materials in advanced electronic and optoelectronic applications.

Main Methods:

  • Literature review of recent advancements in 2D materials.
  • Analysis of physical properties unique to 2D systems.
  • Examination of device architectures utilizing 2D heterostructures.

Main Results:

  • Observation of distinct 2D physics, including absence of long-range order and 2D excitons.
  • Development of novel heterostructure devices like tunneling transistors and resonant tunneling diodes.
  • Demonstration of functionalities in 2D heterostructures not achievable with conventional materials.

Conclusions:

  • 2D materials offer a platform for exploring fundamental physics and creating next-generation devices.
  • The unique properties of 2D crystals are crucial for the performance of novel heterostructures.
  • Continued research into 2D materials promises significant advancements in electronics and photonics.