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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.0K
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...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.2K
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...
1.2K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.2K
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...
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Tunable Spin Injection in High-Quality Graphene with One-Dimensional Contacts.

Victor H Guarochico-Moreira1,2, Jose L Sambricio1, Khalid Omari1

  • 1Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K.

Nano Letters
|January 28, 2022
PubMed
Summary
This summary is machine-generated.

Researchers achieved efficient spin injection in graphene using novel 1D contacts within van der Waals heterostructures. This breakthrough enables high-quality graphene channels for spintronics and quantum computing applications.

Keywords:
1D contactsgraphenehBNspin injectionvan der Waals devices

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Area of Science:

  • Physics
  • Materials Science
  • Quantum Computing

Background:

  • Spintronics utilizes low-dimensional electronic systems for quantum computation.
  • Standard 2D tunnel contacts in graphene introduce impurities and doping, hindering spin transport.
  • Improving spin transport in graphene is crucial for advanced electronic devices.

Purpose of the Study:

  • To demonstrate efficient spin injection and tunable spin signals in encapsulated graphene.
  • To overcome limitations of 2D tunnel contacts using novel 1D contacts.
  • To enable high-quality graphene channels for spintronics.

Main Methods:

  • Fabrication of van der Waals heterostructures with 1D contacts.
  • Encapsulation of graphene to minimize impurities.
  • Characterization of spin injection and transport properties at room and low temperatures.

Main Results:

  • Achieved efficient spin injection and tunable spin signals in fully encapsulated graphene.
  • Utilized 1D contacts to prevent graphene channel doping, resulting in high mobilities (up to 130,000 cm² V⁻¹ s⁻¹).
  • Observed spin diffusion lengths approaching 20 μm and enhanced spin signals via electrostatic gating.

Conclusions:

  • 1D contacts in van der Waals heterostructures offer a promising route for high-performance spintronic devices.
  • This architecture enables high-quality graphene channels with tunable spin properties.
  • The findings pave the way for advanced quantum computing and spintronic applications.