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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Spin–Spin Coupling: One-Bond Coupling01:17

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

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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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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.
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Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Related Experiment Video

Updated: Apr 6, 2026

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Coupling Ferroelectricity with Spin-Valley Physics in Oxide-Based Heterostructures.

Kunihiko Yamauchi1, Paolo Barone2, Tatsuya Shishidou3

  • 1ISIR-SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

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|August 1, 2015
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Summary

Researchers explored spin-valley coupling in BiAlO3/BiIrO3 heterostructures, finding ferroelectricity can control spin polarization for advanced spintronic and valleytronic devices.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • The coupling of spin and valley degrees of freedom is crucial for next-generation spintronic and valleytronic devices.
  • Ferroelectric heterostructures offer potential for novel electronic functionalities.

Purpose of the Study:

  • To investigate the spin-valley coupling in the BiAlO3/BiIrO3 ferroelectric heterostructure.
  • To explore the role of ferroelectricity in manipulating spin polarization for valleytronic applications.

Main Methods:

  • Theoretical investigation of the BiAlO3/BiIrO3 heterostructure.
  • Analysis of the interplay between crystal field, layer degrees of freedom, and spin-orbit coupling.

Main Results:

  • A strong spin-valley coupling was identified in the BiAlO3/BiIrO3 system.
  • Ferroelectricity was shown to provide a nonvolatile mechanism for controlling valley-contrasting spin polarization.

Conclusions:

  • The BiAlO3/BiIrO3 ferroelectric heterostructure is a promising platform for realizing advanced valleytronic devices.
  • Ferroelectric control of spin polarization opens new avenues for nonvolatile spintronic applications.