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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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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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Updated: Jun 23, 2025

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Chirality-Induced Phonon-Spin Conversion at an Interface.

T Funato1,2, M Matsuo2,3,4,5, T Kato6

  • 1Center for Spintronics Research Network, Keio University, Yokohama 223-8522, Japan.

Physical Review Letters
|June 21, 2024
PubMed
Summary
This summary is machine-generated.

Chiral phonons can inject spin into metals, enabling spintronic devices without heavy elements. This phonon-spin conversion mechanism offers a new pathway for advanced electronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Chiral phonons are associated with microrotation.
  • Spin injection is crucial for spintronic devices.
  • Current spintronics often relies on heavy elements.

Purpose of the Study:

  • To investigate spin injection driven by nonequilibrium chiral phonons.
  • To understand the microscopic origin of phonon-spin conversion.
  • To explore alternatives for heavy-element-free spintronics.

Main Methods:

  • Derivation of a microscopic formula for spin injection rate.
  • Analysis of electron spin coupling with chiral phonon microrotation.
  • Modeling of spin current generation at a metal-insulator interface.

Main Results:

  • Established a direct link between chiral phonons and spin injection.
  • Quantified the spin injection rate at the interface.
  • Demonstrated phonon-spin conversion via electron spin-microrotation coupling.

Conclusions:

  • Chiral phonons provide a mechanism for spin injection into metals.
  • The findings offer a pathway for developing heavy-element-free spintronic devices.
  • This research could lead to breakthroughs in novel spintronic applications.