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Chemistry

Dynamic Breaking of Mirror Symmetry in Spin-Dependent Electron Transport through Chiral Media Causes Enantiomeric Excesses

Yossi Paltiel, Daniel Goldberg, et al.

Featured June 7, 2026

Original Paper

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Simply

Chiral molecules act like filters that sort electrons by spin differently depending on their shape, which explains why life consistently chose one specific handedness for its building blocks.

In depth
The paper identifies that spin-orbit coupling in chiral molecules contains a non-local topological component that differs in phase between enantiomers. This phase difference leads to an enantiomer-specific spin-polarization of electrons, which influences chemical kinetics and surface interactions, providing a physical mechanism for the emergence of biological homochirality.

Key Takeaways

  • 1
    The spin-orbit coupling operator in chiral systems contains a non-local topological term that differs in phase between enantiomers.
  • 2
    This phase difference results in distinct spin-polarization vectors relative to the molecular frame, even when energy levels are identical.
  • 3
    The observed asymmetry in spin-dependent electron transport provides a universal physical basis for the selection of specific molecular handedness in prebiotic evolution.

Conceptual Flow

HIGH LEVEL
1
Methodology

The researchers combined theoretical physics with experiments to see how chiral molecules affect electron spin.

Chiral Molecules
Magnetic Surfaces
Measure Electron Spin Transport
Spin Polarization Data
2
Results

They found that mirror-image molecules treat electron spin differently, creating a bias that could explain why life prefers one side.

Left Handed Molecule

Right Handed Molecule

Compare Spin Output

Asymmetric Spin Bias