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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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The Quantum-Mechanical Model of an Atom02:45

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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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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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プログラム可能な量子渦衝突器における音の放出と消去

W J Kwon1,2, G Del Pace3,4, K Xhani3,4

  • 1European Laboratory for Nonlinear Spectroscopy (LENS), Sesto Fiorentino, Italy. kwon@lens.unifi.it.

Nature
|December 2, 2021
PubMed
まとめ
この要約は機械生成です。

量子渦は 拡散ではなく 音の放射でエネルギーを失います 実験により フェルミオン準粒子がこの散乱に大きく影響し 量子乱解の新たな洞察をもたらしました

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科学分野:

  • 量子水力学
  • 凝縮物質物理学
  • 超冷たい原子ガス

背景:

  • 量子流体における渦の動態は,量子化された循環により,古典的な流体とは異なる.
  • 渦中のエネルギーの消耗は 量子乱れ解消の理解に不可欠です
  • 逆戻りできない渦のダイナミクスの 実験的なサインは稀で 深い理解を妨げています

研究 の 目的:

  • 量子流体における不可逆的な渦のダイナミクスの基本的なメカニズムを調査する.
  • 渦のエネルギー放緩における相互摩擦から音の放出を分離する.
  • 量子乱解の新たな経路を探るためだ

主な方法:

  • 平面的で均質な原子フェルミ超流体でプログラム可能な渦巻き衝突器の実現.
  • 超冷たいフェルミガスを使ってオンデマンドの渦の構成の作成とモニタリング.
  • 渦巻き対と逆渦巻き対の衝突を工夫する.

主要な成果:

  • ヴォルテックス・ディポール・アニヒライレーション中の 音波の直接視覚化
  • 異なる超流体体制における非普遍的な分散力学の観測.
  • フェルミオン準粒子による渦散乱の有意な貢献の証拠

結論:

  • 渦中核に定着したフェルミオニク準粒子は 散乱に重要な役割を果たします
  • この研究は,量子渦のダイナミクスを調査するための新しい実験プラットフォームを提供します.
  • この発見は,渦から渦の量子乱解への貢献を調査する道を開きます.