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Optical Activity and Spin Polarization: The Surface Effect.

Tzuriel S Metzger1, Harikrishna Batchu2, Anil Kumar3

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Summary
This summary is machine-generated.

Chiral molecules exhibit unique spin selectivity (CISS effect) influenced by their handedness. This study reveals how substrate type alters CISS properties and their correlation with optical activity, linking CISS to molecular polarizability.

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Area of Science:

  • Molecular chirality and spin physics
  • Surface science and spectroscopy
  • Quantum chemistry

Background:

  • Chirality, or 'handedness,' is fundamental in nature, with chiral molecules existing as non-superimposable mirror images called enantiomers.
  • Optical activity and circular dichroism (CD) are key methods for identifying chiral molecules.
  • The chiral induced spin selectivity (CISS) effect describes spin-dependent electron transport in chiral molecules, influenced by molecular handedness and electron motion direction.

Purpose of the Study:

  • To investigate the relationship between molecular optical activity and the CISS effect.
  • To explore how substrate properties (metallic vs. nonmetallic) affect CD spectra and CISS behavior of chiral molecules.
  • To elucidate the underlying mechanisms connecting CISS and molecular polarizability.

Main Methods:

  • Adsorption of chiral molecules with multiple stereogenic axes onto metallic and nonmetallic substrates.
  • Measurement and analysis of circular dichroism (CD) spectra.
  • Quantum chemical simulations to model CD spectra and CISS properties on different surfaces.

Main Results:

  • CD spectra of enantiomers show identical peak signs when molecules are adsorbed on a metal substrate, unlike in solution or on nonmetallic surfaces.
  • CISS properties are similar for both enantiomers on metallic substrates.
  • On nonmetallic surfaces, the preferred spin in the CISS effect becomes dependent on the molecule's handedness.
  • Quantum chemical simulations successfully explain the observed changes in CD spectra.

Conclusions:

  • Substrate type significantly modulates the interplay between chirality, optical activity, and spin selectivity.
  • The observed correlation between optical activity and CISS effect suggests a link to the molecule's global polarizability.
  • This work provides new insights into controlling and understanding spin-selective transport in chiral systems.