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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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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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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 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

2.8K
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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P-N junction01:11

P-N junction

1.8K
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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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Building 3D Superconductor-Based Josephson Junctions Using a via Transfer Approach.

Cequn Li1, Le Yi1, Kalana D Halanayake2

  • 1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

ACS Nanoscience Au
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Summary
This summary is machine-generated.

Researchers developed a lithography-free method to create high-quality superconductor-graphene interfaces. This enables precise control over the superconducting proximity effect for novel quantum devices.

Keywords:
Andreev reflectionJosephson junctionSuperconducting proximity effectgrapheneniobium nitridevan der Waals heterostructurevia contact

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Engineering

Background:

  • Superconductor-normal metal interfaces are key for quantum states and applications.
  • Conventional methods like lithography often introduce defects, hindering quality.
  • Understanding the superconducting proximity effect requires high-quality interfaces.

Purpose of the Study:

  • To develop a novel, lithography-free method for creating high-quality superconductor-graphene interfaces.
  • To investigate the superconducting proximity effect in such engineered heterostructures.
  • To explore potential applications in quantum devices.

Main Methods:

  • Utilized via contact and dry transfer for van der Waals-like coupling.
  • Fabricated interfaces between 3D superconducting NbN/Pd and graphene.
  • Characterized interfaces for contact resistance and superconducting properties.

Main Results:

  • Achieved smooth interfaces with low contact resistance (~130 Ω μm).
  • Observed gate-tunable supercurrent, Fraunhofer patterns, and Andreev reflections.
  • Demonstrated an induced superconducting gap (Δ') in graphene, consistent with planar geometry.

Conclusions:

  • The dry transfer method offers a gentle, damage-free approach for fabricating superconducting heterostructures.
  • This technique is suitable for air- and damage-sensitive materials.
  • The findings pave the way for engineering novel quantum devices with enhanced proximity coupling.