Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.1K
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

1.0K
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
1.0K
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
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
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

60.2K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
60.2K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Two-component exciton condensates in an electron-hole bilayer.

Nature·2026
Same author

Charge density wave in a band insulator.

Nature communications·2026
Same author

Ultrafast Formation of Jahn-Teller Polarons Revealed by State-Selective Excitation in Correlated Spinel Co<sub>3</sub>O<sub>4</sub>.

Journal of the American Chemical Society·2026
Same author

Direct Observation of Tunable Magnons in Epitaxial Lithium Aluminum Ferrite Thin Films.

Nano letters·2026
Same author

Spatially separated bipolar transport and surface electron accumulation in tungsten diselenide nanostructures.

Nanoscale·2026
Same author

Spatially Tunable Interfacial Ferroelectricity in Low-Symmetric WTe<sub>2</sub>.

Nano letters·2025

相关实验视频

Updated: Feb 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.7K

六个状态的时钟物理学在一个原子薄的反铁磁体中.

Frank Y Gao1, Dong Seob Kim1, Chao Lei1

  • 1Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.

Nature materials
|February 23, 2026
PubMed
概括
此摘要是机器生成的。

研究人员研究了NiPS3中的2D XY模型,发现其磁性行为从单层中从3D过渡到2D Berezinskii-Kosterlitz-Thouless (BKT) 状态. 这种BKT阶段在低温下变得不稳定,形成长距离有序状态.

更多相关视频

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.4K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

9.0K

相关实验视频

Last Updated: Feb 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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

Published on: March 24, 2019

8.7K
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

7.4K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

9.0K

科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子材料是一种量子材料.
  • 这就是Spintronics.

背景情况:

  • 量子物质的集体行为和相位过渡是由对称性破坏和拓学所支配的.
  • 2D XY模型展示了Berezinskii-Kosterlitz-Thouless (BKT) 过渡,这对于理解准远程顺序至关重要.
  • 不同类型的场可以破坏BKT阶段的稳定,导致在低温下真正的远程秩序.

研究的目的:

  • 研究范德瓦尔斯反铁磁体NiPS3.3中的BKT过渡和拓动态.
  • 探索从3D到2D磁性行为的过渡,因为NiPS3被稀释成单层.
  • 检查2D BKT阶段的稳定性及其在低温下的转变.

主要方法:

  • 利用非线性光学微极极度测量来探测磁性.
  • 研究了NiPS3的磁性反应,因为它被稀释成单层.
  • 进行蒙特卡洛模拟以证实实验结果.

主要成果:

  • 观察到从多层中的3D XXZ行为突然切换到单层NiPS3.3中的2D BKT类状态.
  • 发现单层BKT相在进一步冷却时变得不稳定.
  • 确定了在低温下转化为长距离顺序的固定状态的变化.

结论:

  • 单层NiPS3表现出BKT状态,不稳定,在低温下过渡到远程顺序.
  • 该研究提供了对2D反铁磁铁的拓动力学和旋转的洞察.
  • 结果为探索量子材料中的拓相过渡开辟了新的途径.