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Superconductor01:24

Superconductor

1.2K
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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Types Of Superconductors01:28

Types Of Superconductors

1.0K
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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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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原子ごとに作られた量子ドットによる近接超伝導

Lucas Schneider1, Khai That Ton2, Ioannis Ioannidis3,4

  • 1Department of Physics, Universität Hamburg, Hamburg, Germany. lucas.schneider@physnet.uni-hamburg.de.

Nature
|August 16, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は,超伝導体上の量子コーラルでアンドリーフ結合状態を観察し,最小限のシステムで近接誘発超伝導性を実証しました. この発見は,長年の理論を検証し,超伝導人工格子の研究を進めています.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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関連する実験動画

Last Updated: Jul 19, 2025

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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科学分野:

  • 凝縮物質物理学
  • 量子材料について
  • 超伝導性

背景:

  • 超伝導体と接触する材料は,近接誘発超伝導性を獲得することができます.
  • この現象により トポロジカルな超伝導や 奇数周波数の超伝導といった 新しい電子相が生まれます
  • 基本的な近接効果を理解するには,最小限のシステムを調査することが不可欠です.

研究 の 目的:

  • 可能な限り最小のシステムで近接効果を調査する: 表面状態の単一の量子レベル.
  • スピン変性アンドリーフ結合状態を実験的に検出し,特徴づけること.
  • 量子システムにおける近接誘発ペアリングの測定方法を確立する.

主な方法:

  • スキャニング・トンネル顕微鏡を用いた超伝導基板の量子コーラルの製造.
  • 量子コーラルの固有モードを フェルミエネルギーに調整する
  • トンネルスペクトロスコーピーは,インギャップ状態を検出し,それらのアンチクロスメントを分析します.

主要な成果:

  • カーラルの固有モードがフェルミエネルギーに近い時,超伝導ギャップに入る粒子の対称状態のペアを観測した.
  • 50年前に予測された アンドリーフ・バインド状態です
  • インギャップ状態の対交差は,近接誘発のペアリングの定量的な尺度として機能する.

結論:

  • この研究は,トンネルスペクトロスコーピーによるスピン変性アンドリーフ結合状態の最初の実験的検出を提供します.
  • 超伝導性を表面状態に誘導する 可能性が確認された
  • 超伝導人工格子を作り,超伝導体における不純物誘発状態を解釈する道を開く.