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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.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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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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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 one, the...
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Maximal Rashba-like spin splitting via kinetic-energy-coupled inversion-symmetry breaking.

Veronika Sunko1,2, H Rosner2, P Kushwaha2

  • 1SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK.

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Researchers engineered a novel mechanism to break inversion symmetry in solids, significantly enhancing spin-orbit interactions. This breakthrough enables larger Rashba-like spin splittings in surface electrons, paving the way for new quantum computing materials and memory devices.

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Area of Science:

  • Condensed-matter physics
  • Materials science
  • Surface science

Background:

  • Breaking inversion symmetry is crucial for advanced electronic states and applications like quantum computing and ferroelectric memory.
  • Existing methods struggle to maximize the influence of broken inversion symmetry on electronic states, especially at surfaces.

Purpose of the Study:

  • To present a novel mechanism for significantly enhancing the coupling of inversion-symmetry breaking to itinerant surface electrons.
  • To achieve a kinetic-energy-coupled inversion-symmetry breaking with an energy scale substantial to the material's bandwidth.

Main Methods:

  • Utilized spin- and angle-resolved photoemission spectroscopy to demonstrate the proposed mechanism.
  • Investigated delafossite oxides, specifically CoO2 and RhO2 derived surface states.

Main Results:

  • Demonstrated a much larger coupling of inversion-symmetry breaking to surface electrons than typically achieved.
  • Observed significantly enhanced Rashba-like spin splittings due to strong inversion-symmetry breaking and spin-orbit interactions.
  • Showcased that the spin splitting in delafossite oxides is governed by the full atomic spin-orbit coupling of transition metals, leading to record-high values.

Conclusions:

  • The developed mechanism provides a route to engineer substantial inversion-symmetry breaking, leading to large spin-orbit effects.
  • The findings offer opportunities for creating spin-textured electronic states and designing novel oxide heterostructures.
  • The common structural motifs suggest broad applicability across various material classes for interfacial control of electronic properties.