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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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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Spin-orbit coupling (SOC) is fundamental to spintronic phenomena.
  • Graphene's weak intrinsic SOC limits its spintronic applications.
  • Hydrogen adatoms are known to modify graphene's electronic properties.

Purpose of the Study:

  • To investigate the impact of hydrogen adatoms on spin-orbit coupling in graphene.
  • To understand the mechanism behind SOC enhancement in hydrogenated graphene.
  • To develop minimal Hamiltonians describing SOC effects in graphone and single-adatom systems.

Main Methods:

  • First-principles calculations (e.g., Density Functional Theory).
  • Group theory analysis for symmetry and Hamiltonian construction.
  • Analysis of sp(3) hybridization and lattice distortion effects.

Main Results:

  • Chemisorbed hydrogen induces a giant local enhancement of SOC.
  • SOC enhancement is strongly dependent on local lattice distortion.
  • Reduced symmetry and induced dipole moments are key factors.
  • Linear spin-orbit band splittings arise from broken pseudospin inversion symmetry.

Conclusions:

  • Hydrogen adatoms offer a promising route to engineer strong SOC in graphene.
  • The developed Hamiltonians accurately capture the essential SOC physics.
  • This work paves the way for designing graphene-based spintronic devices with tailored SOC.