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Related Concept Videos

Chirality02:25

Chirality

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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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Chirality in Nature02:30

Chirality in Nature

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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 at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Prochirality02:05

Prochirality

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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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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chern-Protected Flatband Edge State in Metaphotonics.

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We introduce a novel photonic Chern semimetal, a 2D material merging semimetal and Chern insulator properties. This material exhibits unique topological edge states and controllable light speed, advancing topological physics and nanophotonics.

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Area of Science:

  • Topological photonics
  • Condensed matter physics
  • Materials science

Background:

  • Two-dimensional Dirac semimetals have flatband edge states but zero Chern number.
  • Chern insulators possess one-way edge states and a nonzero Chern number.

Purpose of the Study:

  • To demonstrate a novel two-dimensional photonic crystal combining semimetal and Chern insulator properties, termed a Chern semimetal.
  • To experimentally realize and characterize this photonic Chern semimetal.
  • To investigate the control of light speed while maintaining topological protection.

Main Methods:

  • Fabrication of a gyromagnetic photonic crystal with programmable magnetic bias.
  • Tailoring second-neighbor coupling within each sublattice.
  • Experimental characterization of topological edge states and light propagation.

Main Results:

  • Demonstration of a two-dimensional photonic crystal exhibiting Chern semimetal properties.
  • Simultaneous hosting of flatband edge states and one-way edge states.
  • Experimental realization of controllable light speed with preserved topological protection.

Conclusions:

  • The photonic Chern semimetal offers a unique platform for exploring topological phases in bosonic systems.
  • Findings pave the way for new nanophotonic applications and topological physics discoveries.
  • Programmable magnetic bias allows for dynamic control over topological properties.