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関連する概念動画

Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

541
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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位相制御ジョセフソン結合におけるトポロジカル超伝導性

Hechen Ren1,2, Falko Pientka1,3, Sean Hart1,4

  • 1Department of Physics, Harvard University, Cambridge, MA, USA.

Nature
|April 26, 2019
PubMed
まとめ
この要約は機械生成です。

研究者は,HgTe量子井戸のジョセフソン交差点を用いて,トポロジカル超伝導のための2Dプラットフォームを開発しました. このシステムは,量子情報処理のためのマジョラーナ結合状態の作成と操作を可能にします.

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科学分野:

  • 凝縮物質物理学
  • 量子情報科学

背景:

  • トポロジカルな超伝導体は局所的なマジョラーナ状態を境界でホストし,トポロジカルに保護された量子情報にとって不可欠です.
  • 既存の1Dシステムには 微調整が必要で 拡張性がないため 代替プラットフォームの探求が進んでいます

研究 の 目的:

  • 実験的に2次元 (2D) のアーキテクチャを実現する.
  • トポロジカルな超伝導性のプラットフォームとして, HgTe量子井戸のジョセフソン交差点を調査する.

主な方法:

  • 薄膜アルミニウムに結合されたHgTe量子井戸を使用してジョセフソン結合の製造.
  • トポロジカル状態を相差と平面内磁場で調節する.
  • トポロジカル状態を決定するために,交差点の端でトンネル伝導性を測定します.

主要な成果:

  • 微小な超伝導状態でのゼロバイアストンネル伝導率の最小値が観測された.
  • トポロジカル状態で ゼロバイアスのピークを検出しました 磁場が増加しました
  • トポロジカル状態の相差の範囲は磁場とともに体系的に拡大した.

結論:

  • HgTe量子井戸のジョセフソン・ジャンクションは,トポロジカルな超伝導性のための有望な2Dプラットフォームとして機能します.
  • このシステムは Majorana モードの作成と操作を容易にする.
  • 2Dシステムにおけるトポロジカルな超伝導相の探査を可能にします.