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関連する概念動画

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Damped Oscillations01:07

Damped Oscillations

In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Limits with Oscillating Discontinuities01:19

Limits with Oscillating Discontinuities

An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the most...

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関連する実験動画

Updated: May 9, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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トポロジカル・アイソレーターにおける調節可能な非整数高和音生成

C P Schmid1, L Weigl1, P Grössing2

  • 1Institute of Experimental and Applied Physics, University of Regensburg, Regensburg, Germany.

Nature
|May 20, 2021
PubMed
まとめ

研究者はトポロジカル・アイソレーターで高次元のハーモニック放射を発生させ,ユニークな表面効果と制御可能な周波数シフトを観察しました. トポロジーを探求し,新しい電子機器を開発するための扉を開きます.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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関連する実験動画

Last Updated: May 9, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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科学分野:

  • 凝縮物質物理学
  • 量子光学
  • 材料科学

背景:

  • 高度ハーモニック (HH) 生成は,強い光の下の固体における電子動態を明らかにする.
  • トポロジカルな材料は,独自の電子特性により,従来とは異なるHH生成を示すことが予測されています.

研究 の 目的:

  • 3D トポロジカル・アイソレーターでHH生成を実験的に実証し,特徴づけること.
  • トポロジカルな表面状態がHH放出における役割を調査する.
  • トポロジカル・エレクトロニクスにおける潜在的な応用を探求する.

主な方法:

  • ビスムート・テルリドに強烈なテラヘルツ場を用いたHH生成の実験実証.
  • 大量と表面の貢献を区別するためにHHスペクトルの分析.
  • HH排出量に対するキャリアエンベロープ・フェーズ効果の調査

主要な成果:

  • 3D トポロジカル・アイソレーター (ビスムート・テルリッド) で観測されたHH生成の成功.
  • トポロジカルな表面状態からの明確なHH生成は,スピンモメントロックと準相対的分散によって強化されます.
  • ドライビングフィールドのキャリアエンベロープフェーズを変化させることで,HH命令の継続的なシフト.
  • 異常なベリー曲線と曲がりくねったディラクフェルミオン軌道と一致する偏振パターンを観測した.

結論:

  • トポロジカル・アイソレーターは 強いフィールドの物理学とトポロジーを研究するためのユニークなプラットフォームを提供します.
  • 発見は,赤外線周波数で動作する非分散型トポロジック電子の可能性を示唆しています.