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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-Induced Spin-Orbit Coupling and Spin Selectivity.

Massimiliano Di Ventra1, Rafael Gutierrez2, Gianaurelio Cuniberti2,3

  • 1Department of Physics, University of California San Diego, La Jolla, California 92093, United States.

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Summary
This summary is machine-generated.

A helical path induces spin-orbit coupling in traveling spinors, explaining the Chirality-induced Spin Selectivity (CISS) effect. This chirality-induced spin-orbit coupling (χ-SOC) is key to understanding CISS in helical molecules.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • The Chirality-induced Spin Selectivity (CISS) effect is a phenomenon where chiral molecules induce spin polarization in charge carriers.
  • The microscopic origins of the CISS effect are not fully understood, particularly the role of spin-orbit coupling.

Purpose of the Study:

  • To investigate the emergence of spin-orbit coupling in a one-dimensional helical path.
  • To elucidate the potential contribution of this coupling to the CISS effect.

Main Methods:

  • Theoretical analysis of a spinor's behavior along a curved helical path.
  • Estimation of the resulting spin polarization magnitude.

Main Results:

  • A one-dimensional helical path's curvature induces spin-orbit coupling in a traveling spinor.
  • The estimated spin polarization aligns with values observed in chiral molecular structures exhibiting the CISS effect.
  • Chirality-induced spin-orbit coupling (χ-SOC), combined with broken time-reversal symmetry, is proposed as a microscopic basis for CISS.

Conclusions:

  • The curvature of helical paths is a source of spin-orbit coupling.
  • This χ-SOC mechanism provides a potential explanation for the CISS phenomenon in chiral systems.
  • Further research can explore experimental verification and applications of this finding.