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相关概念视频

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

994
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...
994
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

921
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...
921

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相关实验视频

Updated: Jun 22, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

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通过范德瓦尔斯接口进行高效的旋转注入和读出.

Hao Chen1, Wanghao Tian2, Lishu Zhang3

  • 1Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.

Small (Weinheim an der Bergstrasse, Germany)
|July 5, 2024
PubMed
概括

这项研究证明了范德瓦尔斯异构结构中的高旋转读取效率,这对于开发节能旋转电子设备至关重要. 这些结构克服了实际旋转逻辑应用的先前限制.

关键词:
Fe3GeTe2Fe2Fe2Fe2Fe2Fe2Fe3GeTe2Fe2Fe2Fe3Fe2Fe2Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe2Fe3Fe3Fe2Fe3Fe2Fe3韦尔半金属是一种半金属.旋转注射的注入方法旋转读取结果的回转范德瓦尔斯接口的接口

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Last Updated: Jun 22, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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科学领域:

  • 这就是Spintronics.
  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 旋转注入,运输和检测对于节能旋转逻辑设备至关重要.
  • 接口导电不匹配,旋转脱相和低效的旋转电荷转换阻碍了设备的效率.

研究的目的:

  • 为了证明使用All van der Waals异构结构的高旋转读取效率.
  • 探索范德瓦尔斯 (vdW) 异构结构对于自旋电子应用的潜力.

主要方法:

  • 制造一个All van der Waals异构结构,结合一个铁磁铁 (Fe3GeTe2) 和一个韦尔半金属.
  • 测量非局部和局部自旋读出信号.

主要成果:

  • 实现了150mΩ的非局部自旋读取信号和7.8 Ω的局部自旋读取信号.
  • 已证明的信号水平适用于实际的自旋电子设备.
  • 将增强的信号归因于抑制的旋转脱相,长旋转扩散和高效的电荷-旋转相互转换.

结论:

  • 范德瓦尔斯的异构结构可以实现高旋转读数效率.
  • 这些发现为利用VDW接口和旋转霍尔效应的旋转轨道逻辑设备开辟了可能性.