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相关概念视频

Continuous Charge Distributions01:17

Continuous Charge Distributions

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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

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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.
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Quantum Numbers02:43

Quantum Numbers

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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.
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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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Feedback Inhibition00:46

Feedback Inhibition

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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!
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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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.
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相关实验视频

Updated: Jan 20, 2026

Compact Quantum Dots for Single-molecule Imaging
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使用与分布式反腔合的带电量子点进行次单刺激激光

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
概括

半导体量子点 (QD) 现在可以在单次激发极限以下实现激光. 这一突破克服了短的光学增益寿命,使灵活的,可处理的激光装置成为可能.

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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科学领域:

  • 材料科学
  • 光电子产品
  • 纳米技术

背景情况:

  • 体半导体量子点 (QD) 提供了灵活,可处理溶液的光学增益介质的潜力.
  • 非辐射Auger重组显著限制了QD的光学增益寿命,阻碍了它们在激光应用中的使用.

研究的目的:

  • 在量子点中克服光学增益寿命的局限性.
  • 开发一种在单点激励极限以下的量子点激光的方法.
  • 促进可处理溶液的激光装置的开发.

主要方法:

  • QD内部的组成分级以阻碍奥格衰变.
  • 合成后充电QD以抑制寄生虫的基本状态吸收.

主要成果:

  • 将激光值降低到低于单点激发值的值.
  • 证明了一种克服非辐射Auger重组限制的方法.
  • 在量子点中启用激光, 显著改善增益寿命.

结论:

  • 开发的方法有助于创建可处理溶液的激光装置.
  • 这项工作将激光技术的范围扩展到传统的半导体材料之外.
  • 基于量子点的光学增益介质可以有效地用于先进的激光应用.