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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

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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.
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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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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 mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Donor-acceptor pairs in hexagonal boron nitride (hBN) explain quantum emitter properties. This finding aids in identifying and optimizing defect qubits for room-temperature quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Materials Science
  • Solid-State Physics

Background:

  • Optically addressable defect qubits in wide band gap materials are promising for room-temperature quantum information processing.
  • Two-dimensional (2D) hexagonal boron nitride (hBN) offers potential for scalable quantum emitter and memory preparation.
  • The microscopic origin and optical properties of reported hBN defect qubits remain unclear.

Purpose of the Study:

  • To elucidate the microscopic origin of quantum emitters in hBN.
  • To understand the nature of optical transitions and optically detected magnetic resonance (ODMR) in hBN defect qubits.
  • To connect quantum emitter properties to specific defect structures.

Main Methods:

  • Utilized ab initio calculations to model defect structures in hBN.
  • Investigated the relationship between optical spectra, lifetimes, and spectral stability.
  • Analyzed the conditions for observing ODMR signals in potential defect qubit systems.

Main Results:

  • Established a connection between quantum emitter characteristics and donor-acceptor pairs (DAPs) in hBN.
  • Demonstrated that DAPs can exhibit ODMR signals for the acceptor, with an S = 1/2 ground state at non-zero magnetic fields.
  • Identified hyperfine interaction as the dominant mechanism mediating ODMR signals, dependent on the donor partner.

Conclusions:

  • The donor-acceptor pair model provides a framework for understanding quantum emitters in hBN.
  • This model facilitates the identification and optimization of defect qubits for quantum applications.
  • The findings pave the way for improved performance of hBN-based quantum technologies.