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関連する概念動画

Continuous Charge Distributions01:17

Continuous Charge Distributions

7.9K
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...
7.9K
Energy Associated With a Charge Distribution01:21

Energy Associated With a Charge Distribution

1.9K
The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
1.9K
Quantum Numbers02:43

Quantum Numbers

49.4K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
49.4K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

56.6K
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.
56.6K
Feedback Inhibition00:46

Feedback Inhibition

56.9K
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
56.9K
Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

61.7K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
61.7K

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関連する実験動画

Updated: Jan 20, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

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分散フィードバックキャビティに接続された充電量子ドットを使用したサブシングルエクシトンレーシング

Oleg V Kozlov1, Young-Shin Park1,2, Jeongkyun Roh1

  • 1Chemistry Division, C-PCS, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Science (New York, N.Y.)
|August 17, 2019
PubMed
まとめ

半導体量子ドット (QD) は,単一エキシトンの限界を下回るレーザーを実現できます. この画期的な発明は 短い光学増益寿命を克服し 柔軟で溶液処理可能なレーザー装置を可能にします

さらに関連する動画

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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関連する実験動画

Last Updated: Jan 20, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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科学分野:

  • 材料科学
  • 光電子機器
  • ナノテクノロジー

背景:

  • コロイド半導体量子ドット (QD) は,柔軟で溶液処理可能な光学増益媒体の可能性を秘めています.
  • 非放射性オーガーの再結合は,QDの光学増益寿命を大幅に制限し,レージングアプリケーションでの使用を妨げます.

研究 の 目的:

  • 量子ドットの短い光学増益寿命の 限界を乗り越えるために
  • シングル・エキシトン・パー・ドット・リミット以下の量子ドットでレーシングを実現する方法を開発する.
  • 溶液処理可能なレーザー装置の開発を容易にする.

主な方法:

  • オーガーの衰退を防ぐためにQDの内部を構成する.
  • QDsの合成後の充電は,寄生体の基底状態の吸収を抑制する.

主要な成果:

  • シングル・エクシトン・パー・ドットの限界値を下回った.
  • 非放射性オーガーの再結合の制限を克服する方法を実証した.
  • 量子ドットでのレーザリングを有効にし ゲイン寿命を大幅に改善しました

結論:

  • 開発されたアプローチは,溶液処理可能なレーザー装置の作成を容易にする.
  • この研究は,レージング技術の範囲を,従来のエピタキシアルで培った半導体材料を超えて広げています.
  • 量子ドットベースの光学ゲインメディアは,高度なレージングアプリケーションで効果的に利用できます.