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Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Graphene valley filter using a line defect.

D Gunlycke1, C T White

  • 1Naval Research Laboratory, Washington, DC 20375, USA.

Physical Review Letters
|April 27, 2011
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a novel graphene valley filter. This device uses a line defect to separate electron and hole quasiparticles based on their valley, achieving near 100% valley polarization without confinement.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Graphene's unique band structure, featuring two degenerate valleys at the Fermi level, offers potential for novel electronic devices.
  • Controlling valley properties of charge carriers is crucial for next-generation electronics.

Purpose of the Study:

  • To propose and theoretically investigate a method for valley filtering of quasiparticles in graphene.
  • To demonstrate valley polarization without requiring physical confinement structures.

Main Methods:

  • Utilizing quantum transport calculations to model quasiparticle scattering.
  • Simulating the interaction of electrons and holes with a graphene line defect.

Main Results:

  • A recently observed line defect in graphene acts as a semitransparent scattering center.
  • High angles of incidence lead to quasiparticle transmission with nearly 100% valley polarization.
  • The proposed method achieves valley filtering without introducing spatial confinement.

Conclusions:

  • A graphene line defect can function as an efficient valley filter for electrons and holes.
  • This approach opens new avenues for valleytronics and unconventional electronic applications in graphene.