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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...
Biasing of P-N Junction01:16

Biasing of P-N Junction

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...
P-N junction01:11

P-N junction

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...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Diode: Forward bias01:20

Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...

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Rectification by an imprinted phase in a Josephson junction.

G R Berdiyorov1, M V Milošević, L Covaci

  • 1Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.

Physical Review Letters
|November 24, 2011
PubMed
Summary
This summary is machine-generated.

A Josephson phase shift induced by an Abrikosov vortex enables tunable AC current rectification. This method, utilizing directed antivortex motion, offers an efficient, experimentally accessible alternative to geometric designs for rectification without a magnetic field.

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Area of Science:

  • Superconducting electronics
  • Condensed matter physics
  • Quantum phenomena

Background:

  • Josephson junctions exhibit unique quantum effects crucial for electronic devices.
  • Abrikosov vortices (AVs) are magnetic fluxons in superconductors that can influence Josephson dynamics.
  • Rectification of AC current typically requires asymmetric structures or applied magnetic fields.

Purpose of the Study:

  • To investigate the potential of using a pinned Abrikosov vortex (AV) to induce a Josephson phase shift for current rectification.
  • To explore the rectification capabilities of a Josephson junction with an asymmetrically imprinted phase controlled by AV position.
  • To evaluate the efficiency and experimental feasibility of this vortex-induced rectification mechanism.

Main Methods:

  • Inducing a Josephson phase shift in a Josephson junction using a nearby pinned Abrikosov vortex.
  • Controlling the asymmetry of the imprinted phase by adjusting the position of the Abrikosov vortex.
  • Analyzing the directed motion of Josephson antivortices formed in conjunction with the Abrikosov vortex.
  • Characterizing the rectified voltage output across a range of AC current frequencies.

Main Results:

  • A Josephson phase shift was successfully induced by a nearby pinned Abrikosov vortex.
  • The system demonstrated rectification of AC current over a broad, tunable frequency range.
  • Rectified voltage resulted from the directed motion of a Josephson antivortex, paired with the Abrikosov vortex.
  • The imprinted phase mechanism proved more efficient than asymmetric junction geometry.

Conclusions:

  • A pinned Abrikosov vortex can create an efficient, tunable Josephson ratchet potential for AC current rectification.
  • This vortex-induced rectification mechanism is experimentally accessible and effective even without an applied magnetic field.
  • The directed motion of Josephson antivortices is key to the observed rectification phenomenon.