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相关概念视频

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
878
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

866
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...
866
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

35.1K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
35.1K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

622
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.
622
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

965
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
965

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相关实验视频

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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旋转的光子旋转霍尔效应

Yougang Ke1, Yongfeng Bian1, Qiang Tang1

  • 1School of Information Science and Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用Pancharatnam-Berry相位元表面演示了一种新的3D旋转光子旋转霍尔效应 (PSHE). 这一突破使得三维自旋旋分裂模式成为可能,进步了自旋光子操纵.

关键词:
潘查拉特纳姆 果阶段metasurface 地表的表面是什么光子旋转的霍尔效应旋转霍尔装置的旋转-霍尔装置.旋转轨道相互作用

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科学领域:

  • 光子学和光学 在光子学和光学.
  • 超材料是什么?超材料是什么?
  • 旋转光学 旋转光学

背景情况:

  • 光子旋转霍尔效应 (PSHE) 对基于旋转的光学应用至关重要.
  • 现有的研究主要侧重于横向或纵向的自旋依赖分裂.
  • PSHE的三维 (3D) 自旋分裂模式在科学文献中显著缺席.

研究的目的:

  • 介绍和演示一种新的3D旋转光子旋转霍尔效应 (PSHE).
  • 为了探索这种3D旋转PSHE的可调性,使用工程Pancharatnam-Berry相位元表面.
  • 研究控制自旋依赖分裂模式的旋转和叶片结构的方法.

主要方法:

  • 使用精确设计的Pancharatnam-Berry相介电元面.
  • 研究了单个元表面的旋转分裂模式的行为,以观察沿传播路径的旋转.
  • 采用级联式元表面,通过调整相对元表面方向来证明可调节的旋转角度.
  • 引入了一个动态相,以独立控制旋转依赖分裂模式的叶片数,实现不对称的旋转.

主要成果:

  • 通过单一的元表面在3D空间中旋转和演变,展示了叶片结构的旋转分裂模式.
  • 通过操纵级联元表面的相对角度,展示了分割模式的可调节的旋转角度.
  • 通过动态相位实现,通过自旋依赖分裂模式的叶片数实现独立控制,从而导致不对称的旋转.

结论:

  • 成功引入并实验验证了一种新的3D旋转PSHE.
  • 开发的Pancharatnam-Berry相位元表面为旋转光子的多维操纵提供了一个多功能平台.
  • 潜在的应用包括先进的光学显微镜和其他自旋光子技术.