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関連する概念動画

Electric Field at the Surface of a Conductor01:26

Electric Field at the Surface of a Conductor

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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
In the 19th century, Michael Faraday conducted the famous ice pail experiment to prove that the charges always reside on the surface of a conductor. The experimental set-up consists of a conducting uncharged container mounted on an insulating stand. The outer surface of the container is...
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to 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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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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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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Bipolar Junction Transistor01:22

Bipolar Junction Transistor

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Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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グラフェンにおける双極超電流は,

Hubert B Heersche1, Pablo Jarillo-Herrero, Jeroen B Oostinga

  • 1Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands. h.b.heersche@tudelft.nl

Nature
|March 3, 2007
PubMed
まとめ
この要約は機械生成です。

研究者は,電子と穴によって運ばれる超電流を観察して,グラフェンにおけるジョセフソン効果を探求した. 特に,超電流はゼロ電荷密度でも流れ,ユニークな電子輸送特性を強調しました.

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関連する実験動画

Last Updated: May 5, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 量子エレクトロニクス 量子エレクトロニクス

背景:

  • グラフェンはユニークな電子特性を発揮し,電荷キャリアは質量のないキラル相対論粒子のように振る舞う.
  • 異常な量子ホール伝導性とディラク点における有限伝導性は,グラフェンの重要な現象である.
  • グラフェンにおける電荷輸送の理解は,新しい電子アプリケーションにとって極めて重要です.

研究 の 目的:

  • メソスコピックグラフェン結合におけるジョセフソン効果を実験的に調査する.
  • グラフェンの超電流に対する電荷密度の影響を調査する.
  • ダイラック点における時間逆行対称性と相相相合性の役割を明らかにする.

主な方法:

  • 超伝導電極によるメソスコピックグラフェン結合の製造.
  • ゲート電極を使用して,グラフェン層の電荷密度を制御します.
  • 超電流と正常状態の伝導性を実験的に測定する.

主要な成果:

  • 電子と穴の両方によって運ばれる超電流の観測,ゲート電圧によって調節可能.
  • ゼロの電荷密度 (ディラック点) で有限な超電流の流れの実証.
  • ディラック点における相相一致電子輸送の証拠.

結論:

  • グラフェンのユニークな電子構造は,電子と穴の両方を含む超電流を可能にします.
  • ディラク点における有限な超電流は,時逆対称性の重要性を強調する.
  • これらの発見は,グラフェンに基づいた高度な量子電子装置の道を開く.