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関連する概念動画

Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
Calculation of Electric Flux01:25

Calculation of Electric Flux

Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

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関連する実験動画

Updated: Jun 29, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

量子接触点からのコヒーレント電子の流れをイメージする.

Topinka1, LeRoy, Shaw

  • 1Division of Engineering and Applied Sciences, Department of Physics, and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA. Materials Department, University of California, Santa Barbara, CA 93106, USA.

Science (New York, N.Y.)
|September 29, 2000
PubMed
まとめ

研究者は,充電された先端を使用して,量子点接触における一貫した電子の流れをイメージした. このテクニックは,ナノ構造における電子の行動と伝導率の定量化を視覚化します.

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

関連する実験動画

Last Updated: Jun 29, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
05:11

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 量子力学は,量子力学という
  • ナノテクノロジー ナノテクノロジー

背景:

  • 半導体ナノ構造における二次元電子ガス (2DEGs) は量子現象を示している.
  • 量子点接触 (QPC) は,ナノスケールでの電子伝送の研究に不可欠です.
  • 閉じ込められたシステムにおける電子の流れを理解することは,将来の電子機器にとって不可欠です.

研究 の 目的:

  • QPCにおけるコヘラン電子の流れをイメージする方法を開発する.
  • 導電量定量化の理論的予測を実験的に検証する.
  • 量子輸送における個々の電子モードの役割を調査する.

主な方法:

  • 充電した先を持つスキャニングプローブ顕微鏡を使用して,GaAs/AlGaAsヘテロ構造の2DEGを検出しました.
  • 量子相関性を維持するために液体ヘリウム温度で動作する.
  • QPCの幅を変化させ,電気伝導量の変化を観察した.

主要な成果:

  • QPCの最も低い量子化されたモードからコヘラン電子の流れを成功裏にイメージしました.
  • 観測された電気伝導性は,QPCの幅が大きくなるにつれて2 e(2) /hの量子化ステップで増加しています.
  • 電子の半波長で隔てられた干渉フリンジが検出され,理論的な予測が確認されました.
  • 局所的な尖端誘発的干渉が特定のチャネルにおける導電性を選択的に減少させることを実証した.

結論:

  • 充電チップスキャニング技術は,QPCにおける電子波関数のリアル空間イメージングを提供します.
  • 実験結果は,量子輸送と導電量定量化の理論モデルを強く支持しています.
  • この方法は,個々の電子伝導チャネルの操作と研究を可能にします.