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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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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
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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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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Chiral Phonons: Prediction, Verification, and Application.

Tingting Wang1, Hong Sun1, Xiaozhe Li1

  • 1Phonon Engineering Research Center of Jiangsu Province, Ministry of Education Key Laboratory of NSLSCS, Center for Quantum Transport and Thermal Energy Science, Institute of Physics Frontiers and Interdisciplinary Sciences, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.

Nano Letters
|April 8, 2024
PubMed
Summary
This summary is machine-generated.

Chiral phonons, once thought non-existent, are now experimentally verified. This discovery opens new avenues for exploring phonon-related physics and applications in condensed matter.

Keywords:
chiral phononlattice symmetryoptical propertiesphonon angular momentumphonon pseudoangular momentum

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Solid-state physics

Background:

  • Chirality, an asymmetric property, is fundamental in nature and elementary particle physics.
  • Phonons, crucial excitations in solids, were traditionally considered nonchiral.
  • Recent theoretical and experimental findings reveal the existence of chiral phonons.

Purpose of the Study:

  • To review the theoretical predictions of chiral phonons.
  • To present experimental detection methods for chiral phonons.
  • To highlight applications and challenges of chiral phonons in various fields.

Main Methods:

  • Theoretical modeling and prediction of chiral phonon behavior.
  • Experimental verification using advanced detection techniques.
  • Analysis of phonon properties in condensed matter systems.

Main Results:

  • Confirmation of chirality in phonons, challenging previous assumptions.
  • Development and application of diverse experimental methods for detection.
  • Identification of key areas for future research and technological integration.

Conclusions:

  • The discovery of chiral phonons represents a significant advancement in condensed matter physics.
  • Chiral phonons offer new possibilities for manipulating quantum phenomena and developing novel devices.
  • Further research is crucial to fully harness the potential of chiral phonons.