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Related Concept Videos

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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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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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Floquet-engineered chiral-induced spin selectivity.

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Chiral-induced spin selectivity (CISS) is demonstrated in achiral systems using laser fields. This opens new avenues for controlling electron spin in materials for spintronics and chemical applications.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Materials science

Background:

  • Electron spin control is vital for material properties and applications like spintronics.
  • Chiral-induced spin selectivity (CISS) links electron spin to molecular chirality.
  • Existing CISS phenomena are limited to chiral molecules.

Purpose of the Study:

  • To investigate chiral-induced spin selectivity (CISS) in achiral systems using external laser fields.
  • To explore the potential of Floquet engineering for spin-dependent electron transport.
  • To determine conditions for achieving high spin polarization in driven systems.

Main Methods:

  • Application of Floquet theory to time-periodically driven systems.
  • Theoretical investigation of spin-dependent electron transport in a two-terminal setup.
  • Analysis of electron transport through achiral and helical molecules under laser irradiation.

Main Results:

  • Demonstrated CISS in achiral systems driven by circularly polarized laser fields.
  • Achieved near-unity spin polarization under specific conditions (high light intensity, low dephasing, optimal chemical potential).
  • Showed that combining chiral molecules with light-matter interactions broadens the energy range for high spin polarization.

Conclusions:

  • Floquet engineering enables CISS in achiral systems, expanding its applicability.
  • External laser fields offer a tunable method for controlling electron spin selectivity.
  • This research paves the way for novel spintronic devices and tailored chemical reactions.