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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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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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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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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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The Pauli Exclusion Principle03:06

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The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Canted Persistent Spin Texture and Quantum Spin Hall Effect in WTe_{2}.

Jose H Garcia1, Marc Vila1,2, Chuang-Han Hsu3

  • 1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.

Physical Review Letters
|January 8, 2021
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new quantum spin Hall phase in monolayer WTe2. This material shows unique spin textures and quantized spin Hall conductivity, offering new ways to control spin information.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Topological materials host unique electronic properties.
  • Quantum spin Hall (QSH) effect is a key topological phenomenon.
  • Monolayer transition metal dichalcogenides are promising for novel electronic applications.

Purpose of the Study:

  • To investigate the quantum spin Hall phase in monolayer WTe2.
  • To explore the spin texture and conductivity properties of this material.
  • To understand the implications for topological materials and spintronics.

Main Methods:

  • Large-scale quantum simulations.
  • Realistic tight-binding model derived from first-principle calculations.
  • Analysis of spin Hall conductivity tensor and nonlocal resistances.

Main Results:

  • Discovery of an unconventional QSH phase in monolayer WTe2.
  • Observation of a canted spin texture in the yz plane.
  • Quantized spin Hall conductivity (2e^2/h) with a spin quantization axis parallel to the canting direction.
  • Topologically protected boundary states with non-trivial spin polarization.

Conclusions:

  • Monolayer WTe2 exhibits a unique QSH effect due to its low symmetry.
  • The canted spin texture influences the spin polarization of edge states.
  • This finding opens avenues for novel spintronic devices and requires specific experimental designs.