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Related Concept Videos

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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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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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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Superconductor01:24

Superconductor

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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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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.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Overlap junctions for superconducting quantum electronics and amplifiers.

Mustafa Bal1,2, Junling Long1,2, Ruichen Zhao1,2

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA.

Applied Physics Letters
|March 12, 2025
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Summary
This summary is machine-generated.

We developed a simple, high-yield fabrication process for micrometer-scale Josephson junctions. This enables efficient creation of superconducting quantum devices like parametric amplifiers with high gain and low loss.

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Area of Science:

  • Quantum Information Science
  • Superconducting Electronics
  • Materials Science

Background:

  • Josephson junctions are crucial for superconducting quantum computing due to their unique properties.
  • Previous work established a submicrometer overlap junction fabrication process for qubits.
  • Extending this process to larger scales is necessary for diverse quantum devices.

Purpose of the Study:

  • To adapt a two-layer overlap junction fabrication process for micrometer-scale devices.
  • To demonstrate the fabrication of other superconducting quantum devices beyond qubits.
  • To assess the performance of these micrometer-scale junctions in practical applications.

Main Methods:

  • Extension of a previously developed two-layer, submicrometer overlap junction fabrication process.
  • Application of the process to fabricate micrometer-scale Josephson junctions.
  • Integration of these junctions into a Josephson parametric amplifier design.

Main Results:

  • Successful fabrication of micrometer-scale overlap junctions using a simplified, two-layer process.
  • Demonstration of a Josephson parametric amplifier with ~30 dB gain.
  • Achieved frequency-tunable devices with negligible insertion loss.

Conclusions:

  • The overlap junction fabrication process is versatile, extending from submicrometer to micrometer scales.
  • This efficient process facilitates the creation of high-performance superconducting quantum devices.
  • The method offers high yield, minimal infrastructure requirements, and state-of-the-art performance.