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関連する概念動画

Bewley Lattice Diagram01:12

Bewley Lattice Diagram

1.5K
The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
1.5K
Fermi Level Dynamics01:12

Fermi Level Dynamics

817
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
817
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.0K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
13.0K
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

3.2K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
3.2K
The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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関連する実験動画

Updated: Feb 21, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

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フェルミ変性三次元光学格子時計

S L Campbell1,2, R B Hutson1,2, G E Marti1

  • 1JILA, National Institute of Standards and Technology (NIST) and University of Colorado Boulder, 440 UCB, Boulder, CO 80309, USA.

Science (New York, N.Y.)
|October 7, 2017
PubMed
まとめ

ストロンチウム光学格子時計は,変性フェルミガスを3D格子で使用することで,より高い精度を達成します. この方法は原子相互作用を解決し,密度に依存する周波数シフトを減らし,時計の安定性と精度を向上させます.

さらに関連する動画

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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関連する実験動画

Last Updated: Feb 21, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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科学分野:

  • 原子物理学
  • 量子メトロロジー
  • 光学時計

背景:

  • ストロンチウム光学格子時計は 何百万もの原子を調査することで 高い精度を提供します
  • 原子相互作用は,密度依存の周波数シフトにより,時計の精度を制限します.
  • これまでの方法では 時計の安定性と精度との間のトレードオフに 直面していました

研究 の 目的:

  • ストロンチウム光学格子時計の精度を向上させるためのスケーラブルなソリューションを開発する.
  • 原子相互作用によって引き起こされる密度依存の周波数シフトを緩和する.
  • 原子時計の比較でより高い精度を達成するために.

主な方法:

  • 変性フェルミガスを 3次元光学格子で利用する
  • 原子密度の高さを利用して 相互作用のシフトを最小限に抑える
  • 格子領域間の同期クロック比較を実行する.

主要な成果:

  • コントラクトの相互作用を解決し,クロックシフトへの貢献を減らす方法を示した.
  • 前回の実験より 大きさの順序を低くした.
  • 1時間で5 × 10−19の測定精度を得ました.

結論:

  • 高精度な原子時計のスケーラブルなソリューションを 提供しています
  • このアプローチは,以前の制限を克服し,現場での相互作用のシフトを効果的に防ぎます.
  • 証明された精度は 光学時計技術の 重要な進歩を表しています