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関連する概念動画

Ferromagnetism01:31

Ferromagnetism

3.2K
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...
3.2K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

2.4K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
2.4K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.4K
Fermi Level01:18

Fermi Level

2.0K
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
2.0K
Diamagnetism01:26

Diamagnetism

3.1K
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....
3.1K
Paramagnetism01:30

Paramagnetism

3.1K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.1K

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関連する実験動画

Updated: Mar 1, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

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冷たい原子のフェルミ・ハバード反鉄磁石

Anton Mazurenko1, Christie S Chiu1, Geoffrey Ji1

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

Nature
|May 26, 2017
PubMed
まとめ

研究者は光学格子に 超冷たいフェルミオンを使って 反鉄磁石を作りました このシステムは フェルミ-ハバードモデルを模倣し 複合量子状態の洞察を 提供する ドーピングされた場合でも 永続的な磁気相関を示します

さらに関連する動画

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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関連する実験動画

Last Updated: Mar 1, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Published on: March 30, 2017

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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科学分野:

  • 凝縮物質物理学
  • 量子シミュレーション

背景:

  • 強く相関する電子系におけるエキゾチックな現象は,スピン・モーションの相互作用から生じる.
  • ドーピングされたアンチフェロマグネットは 擬似ギャップ状態と高温超伝導性を引き起こします
  • 光学網における超冷たいフェルミオンによる量子シミュレーションは,凝縮物質物理学の未解決の問題を解決します.

研究 の 目的:

  • 2次元光学格子で反鉄磁石を反射的に相互作用するフェルミガスで実現し,研究する.
  • ドーピングによる磁気相関の持続性を調査する.
  • フェルミ・ハバードモデルの挑戦的な数値シミュレーションのための実験的基準を提供する.

主な方法:

  • 超冷たいフェルミオンを二次元正方形の光学格子に利用した.
  • トンネリングエネルギーの0.25倍の温度で反鉄磁気長距離を 達成した.
  • 量子ガス顕微鏡を用いて システムの性質を観察した.

主要な成果:

  • 長距離の順序で反鉄磁石を実現し,相関長さはシステムサイズに達し,基本状態に近い散らばった磁化.
  • 15%までのドーピングで反鉄磁気順序ベクトルで強い磁気相関が観察された.
  • 低温フェルミ-ハバードモデルを研究するための冷原子顕微鏡の有効性を実証した.

結論:

  • この実験システムは,強く相関する電子現象を研究するための貴重なプラットフォームとして機能します.
  • 冷原子量子シミュレーションは,複雑な多体状態を理解するための重要な実験データを提供します.
  • この発見はフェルミ・ハバードモデルと 関連する量子材料の理解を 進めている.