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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Joule-Thomson Effect01:21

Joule-Thomson Effect

11.1K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Superconductor01:24

Superconductor

2.0K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Supercurrent in van der Waals Josephson junction.

Naoto Yabuki1, Rai Moriya1, Miho Arai1

  • 1Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electronics

Background:

  • Josephson junctions are crucial for electronics, but limited by interface quality and non-superconducting materials.
  • Traditional Josephson junctions require decoupling superconductor wavefunctions with intervening materials.

Purpose of the Study:

  • To demonstrate a new method for creating Josephson junctions using van der Waals (vdW) contacts in exfoliated layered superconductors.
  • To overcome limitations of conventional Josephson junctions by utilizing atomically flat vdW interfaces.

Main Methods:

  • Exfoliation of layered dichalcogenide superconductor (NbSe2).
  • Fabrication of Josephson junctions using van der Waals (vdW) heterostructure technology.
  • Elimination of heat treatment during junction preparation to ensure interface quality.

Main Results:

  • Successfully constructed Josephson junctions using vdW interfaces between exfoliated NbSe2 crystals.
  • Achieved sufficient wavefunction decoupling across the artificial vdW interface.
  • Demonstrated high supercurrent transparency in the vdW Josephson junction.

Conclusions:

  • Atomically flat vdW interfaces can be effectively used to create high-performance Josephson junctions.
  • This approach offers a promising alternative to conventional Josephson junction fabrication, enhancing functionality in quantum electronics.