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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.
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

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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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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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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

272
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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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Field-free Josephson diode effect in interacting chiral quantum dot junctions.

Debika Debnath1, Paramita Dutta1

  • 1Theoretical Physics Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2025
PubMed
Summary

We demonstrate a field-free Josephson diode effect in chiral quantum dots due to electron interactions. This quantum dot Josephson diode shows tunable rectification, offering potential for superconductor-based devices.

Keywords:
Josephson currentJosephson diodequantum dot

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Nanotechnology

Background:

  • Josephson junctions are crucial for superconducting devices.
  • Quantum dots offer tunable electronic properties.
  • Chirality in quantum systems can lead to unique transport phenomena.

Purpose of the Study:

  • To investigate the Josephson diode effect (JDE) in chiral quantum dot (QD) based Josephson junctions.
  • To explore the role of electron-electron interactions and chirality in inducing a field-free JDE.
  • To analyze the rectification coefficient (RC) and its dependence on system parameters.

Main Methods:

  • Utilized the Keldysh non-equilibrium Green's function technique.
  • Modeled a chiral quantum dot Josephson junction with electron-electron interactions.
  • Calculated Josephson current and rectification coefficient under non-equilibrium transport.

Main Results:

  • Observed a correlation-induced, field-free Josephson diode effect.
  • Demonstrated that electron-electron interaction effectively magnetizes the chiral QD.
  • Showcased a sign-changing behavior of the RC with Coulomb correlation and coupling strength.
  • Achieved a maximum rectification coefficient of approximately 72% for moderate interaction strength.

Conclusions:

  • The interacting chiral quantum dot junction exhibits a field-free Josephson diode effect.
  • The interplay of chirality and Coulomb interaction is key to achieving this effect.
  • This system presents a promising candidate for novel switching components in superconducting electronics.