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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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 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.
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sp3d and sp3d 2 Hybridization
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Tuning and exploiting interlayer coupling in two-dimensional van der Waals heterostructures.

Chenyin Jiao1, Shenghai Pei1, Song Wu1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)
|September 29, 2023
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) layered materials form heterostructures (HSs) where interlayer coupling influences properties. Stacking order, electric fields, intercalation, and pressure are key tuning methods for 2D HSs.

Keywords:
2D materialselectric fieldintercalationinterlayer couplingpressurestacking ordervdW interaction

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) layered materials enable novel material systems through van der Waals (vdW) interactions.
  • Stacking 2D atomic layers creates interlayer interfaces, offering a tunable degree of freedom distinct from intralayer properties.

Purpose of the Study:

  • To review methods for tuning the interlayer coupling in 2D heterostructures (HSs).
  • To provide a comprehensive overview of how structural, optical, electrical, and magnetic properties are modulated.

Main Methods:

  • Summarizing experimental demonstrations and theoretical predictions.
  • Discussing tuning approaches including stacking order, electric field, intercalation, and pressure.

Main Results:

  • Interlayer coupling in 2D HSs significantly impacts their physical properties.
  • Stacking order, electric field, intercalation, and pressure effectively modulate these properties.
  • A detailed overview of property modulation across structural, optical, electrical, and magnetic domains is presented.

Conclusions:

  • 2D HSs offer a rich platform for fundamental physics research and property engineering.
  • Further research directions include exploring novel tuning techniques and advancing applications of 2D HSs.