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関連する概念動画

The Hall Effect01:30

The Hall Effect

2.4K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.4K
Superconductor01:24

Superconductor

1.1K
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...
1.1K
Types Of Superconductors01:28

Types Of Superconductors

974
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...
974
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.3K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

36.8K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
36.8K
Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

961
Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
961

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関連する実験動画

Updated: Jun 28, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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量子ホール体制における一次元近接超伝導

Julien Barrier1,2, Minsoo Kim3,4, Roshan Krishna Kumar5

  • 1Department of Physics and Astronomy, University of Manchester, Manchester, UK. julien.barrier@icfo.eu.

Nature
|April 24, 2024
PubMed
まとめ

歪んだ二層グラフェンのドメイン壁は,量子ホール体制で強固な超伝導性を可能にします. この突破は,一次元電子チャネルによって制限された非振動的な臨界電流のジョセフソン交差点を可能にします.

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

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関連する実験動画

Last Updated: Jun 28, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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科学分野:

  • 凝縮物質物理学
  • 量子材料について

背景:

  • 超伝導と量子ホール効果を 組み合わせるのは難しい
  • 超伝導クーパーペア輸送は,新しい物理とアプリケーションの鍵です.
  • 超電流を量子ホール伝導体で 実現しようとする以前の試みは 困難に直面した.

研究 の 目的:

  • 超伝導性を高めるために,最小の歪んだ二層グラフェンのドメイン壁の可能性を調査する.
  • 量子ホールで動作するジョセフソン・ジャンクションを探る
  • クーパーペア輸送の性質と,これらのシステムの限界を理解する.

主な方法:

  • ドメイン壁を用いたジョセフソン・ジャンクションの製造.
  • 異なる磁場下での量子ホール体制における臨界電流の測定.
  • ドメイン壁内の一次元電子チャネルの量子伝導性の分析.

主要な成果:

  • ドメインの壁は,量子ホールの状態で強固な近接超伝導性を示す.
  • ジョセフソン・ジャンクションは,超伝導電極の上部クリティカルフィールドの近くで動作します.
  • 臨界電流は振動せず,1Dチャネルの量子伝導性によって制限されます.
  • アンドリエフ結合状態は,量子化フィールドでサポートされます.

結論:

  • 超伝導性と量子ホール効果を組み合わせるユニークなプラットフォームを提供する.
  • 観測された強固な超電流とユニークな電子特性により 基本的な研究とデバイスの応用に 新たな道が開かれています
  • このシステムは,トポロジカルに保護された現象と量子輸送の研究に新しいアプローチを提供します.