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Related Concept Videos

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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Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Van de Graaff Generator01:15

Van de Graaff Generator

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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Ultrafast dynamics in van der Waals heterostructures.

Chenhao Jin1, Eric Yue Ma2,3, Ouri Karni2

  • 1Department of Physics, University of California at Berkeley, Berkeley, CA, USA.

Nature Nanotechnology
|November 7, 2018
PubMed
Summary

Van der Waals heterostructures, particularly transition metal dichalcogenide (TMDC) types, exhibit unique excited-state dynamics due to layer interactions. These dynamics, including charge transfer and interlayer excitons, are crucial for advanced optoelectronic, valleytronic, and spintronic devices.

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

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Van der Waals heterostructures are synthetic quantum materials built from stacked 2D layers.
  • Layer coupling significantly influences the properties of these heterostructures.
  • Transition metal dichalcogenide (TMDC) monolayers are key 2D semiconductors with notable exciton and valley properties.

Purpose of the Study:

  • To review the unique excited-state dynamics in transition metal dichalcogenide (TMDC) heterostructures.
  • To explore the impact of staggered band alignment on electron dynamics.
  • To discuss the relevance of these dynamics for future electronic devices.

Main Methods:

  • Review of recent experimental and theoretical studies.
  • Analysis of electron dynamics across femtosecond to microsecond timescales.
  • Focus on phenomena arising from interlayer coupling and band alignment.

Main Results:

  • Staggered band alignment in TMDC heterostructures drives ultrafast charge transfer and interlayer exciton formation.
  • Long-lived spin and valley polarization in resident carriers are observed.
  • Unique excited-state dynamics are intrinsically linked to heterostructure design.

Conclusions:

  • Excited-state dynamics in TMDC heterostructures are complex and tunable.
  • These dynamics offer pathways for novel optoelectronic, valleytronic, and spintronic applications.
  • Understanding interlayer interactions is critical for harnessing quantum properties.