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関連する概念動画

Molecular Shape and Polarity03:37

Molecular Shape and Polarity

53.0K
Dipole Moment of a Molecule
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Intermolecular Forces03:13

Intermolecular Forces

62.9K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
62.9K
Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

6.0K
Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
6.0K
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.0K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.0K
Diamagnetism01:26

Diamagnetism

2.8K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.8K
Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.8K

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関連する実験動画

Updated: May 4, 2026

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

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量子鉄流体における強力な二極効果

Thierry Lahaye1, Tobias Koch, Bernd Fröhlich

  • 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany. t.lahaye@physik.uni-stuttgart.de

Nature
|August 10, 2007
PubMed
まとめ
この要約は機械生成です。

研究者は,強い二極相互作用を持つクロムボース-アインシュタイン凝縮液を作り,原子雲の形状と膨張の変化を観察しました. この研究は,量子フェロ流体とそのユニークな性質を探求するための扉を開きます.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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関連する実験動画

Last Updated: May 4, 2026

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

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Scanning SQUID Study of Vortex Manipulation by Local Contact
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科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 凝縮物質物理学 凝縮物質物理学
  • 原子物理学 原子物理学とは

背景:

  • 対称性を破る相互作用は,様々な物理系において根本的なものです.
  • 量子ガスにおける二極相互作用は,新しい現象と応用を約束する.
  • 以前の研究では,新しい量子相と量子情報処理能力が予測されていた.

研究 の 目的:

  • ボーゼ-アインシュタインコンデンサートを実現するために,有意な二極相互作用.
  • 量子ガスダイナミクスに対するアニゾトロピック二極二極相互作用の影響を調査する.
  • 量子フェロ流体を作る可能性を調査する.

主な方法:

  • フェシュバッハ共振を用いて,クロームのボース・アインシュタイン凝縮物における相互作用を調節した.
  • アニゾトロプ的磁気二極二極相互作用の効果を高めるために,同位体の接触相互作用を減らす.
  • 二極項を組み込んだ超流体水力力学方程式を用いて,ガスダイナミクスをモデル化.

主要な成果:

  • 強い二極相互作用を持つクロムボース-アインシュタイン凝縮液を成功裏に作成しました.
  • 二極力による原子雲の面比の変化を観測した.
  • 強い二極相互作用のための膨張中の円性の典型的な逆転の抑制を実証した.

結論:

  • 二極相互作用は,ボゼ・アインシュタイン凝縮物の動態を大幅に変化させます.
  • 実験結果は,水力力学方程式における二極項を含む理論的モデルと一致しています.
  • この実現は,量子フェロ流体探査に向けた根本的な一歩です.