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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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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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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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P-N junction01:11

P-N junction

594
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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Schottky Barrier Diode01:27

Schottky Barrier Diode

418
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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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Diode effect in Josephson junctions with a single magnetic atom.

Martina Trahms1, Larissa Melischek2, Jacob F Steiner2

  • 1Fachbereich Physik, Freie Universität Berlin, Berlin, Germany.

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|March 8, 2023
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Summary
This summary is machine-generated.

Researchers created atomic-scale superconducting diodes using single magnetic atoms in Josephson junctions. This breakthrough enables non-reciprocal supercurrents, paving the way for miniaturized, efficient electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Electronics
  • Materials Science

Background:

  • Electronic devices exhibit directional current asymmetry, known as non-reciprocal charge transport, fundamental to diode functionality.
  • The pursuit of low-dissipation electronics drives interest in superconducting diodes, with existing designs in non-centrosymmetric systems.
  • Miniaturization of electronic components is a key goal in modern technology.

Purpose of the Study:

  • To investigate the limits of miniaturization for superconducting diodes.
  • To explore the creation and properties of atomic-scale Josephson junctions.
  • To understand the mechanism behind non-reciprocal supercurrents at the atomic scale.

Main Methods:

  • Fabrication of atomic-scale lead-lead (Pb-Pb) Josephson junctions using a scanning tunneling microscope.
  • Introduction of single magnetic atoms into the junctions to induce asymmetry.
  • Experimental characterization of junction behavior under varying bias directions.
  • Theoretical modeling to elucidate the underlying physical mechanisms.

Main Results:

  • Pristine atomic-scale Pb-Pb junctions showed hysteretic behavior but lacked directional asymmetry.
  • Insertion of a single magnetic atom into the junction induced non-reciprocal supercurrents.
  • The direction of non-reciprocity was found to be dependent on the specific magnetic atom introduced.
  • Theoretical analysis identified electron-hole asymmetric Yu-Shiba-Rusinov states as the source of non-reciprocity.

Conclusions:

  • Atomic-scale Josephson junctions can be engineered to function as diodes.
  • Single-atom manipulation provides a novel method for tuning diode properties.
  • The discovered mechanism offers new pathways for developing next-generation atomic-scale Josephson diodes.