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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Photoprotected spin Hall effect on graphene with substrate induced Rashba spin-orbit coupling.

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We demonstrate how to experimentally achieve the spin Hall effect in graphene using circularly polarized light. This method creates a Floquet topological insulator with tunable spin-dependent edge states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Graphene exhibits unique electronic properties due to its Dirac cones.
  • Spin-orbit coupling (SOC) is crucial for spintronic applications.
  • Topological insulators possess conducting edge states while the bulk remains insulating.

Purpose of the Study:

  • To propose an experimental method for realizing the spin Hall effect in graphene.
  • To investigate the creation of a Floquet topological insulator in graphene.
  • To explore the tunability of spin-dependent edge states and topological phase transitions.

Main Methods:

  • Illuminating graphene on a substrate with circularly polarized monochromatic light.
  • Utilizing substrate-induced Rashba spin-orbit coupling.
  • Analyzing high and intermediate frequency regimes of light-matter interaction.

Main Results:

  • The proposed method induces a controllable Rashba SOC, breaking spin-degeneracy.
  • Circularly polarized light opens a spectral gap, creating a Floquet topological insulator.
  • Spin-dependent edge states are observed, and the spin-Chern number is tunable.

Conclusions:

  • The experimental realization of the spin Hall effect in graphene is feasible.
  • The system transitions into a Floquet topological insulator with controllable properties.
  • Tuning the light-matter coupling strength allows control over topological phase transitions.