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Spinterface Origin for the Chirality-Induced Spin-Selectivity Effect.

Seif Alwan1, Yonatan Dubi1,2

  • 1Department of Chemistry, Ben Gurion University of the Negev, Be'er Sheva 8410501, Israel.

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|August 30, 2021
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Summary
This summary is machine-generated.

A new theory explains the chirality-induced spin-selectivity (CISS) effect in molecular electronics. It proposes spin polarization arises from electrode spin-orbit interactions and molecular solenoid fields, matching experiments with realistic parameters.

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Area of Science:

  • Condensed Matter Physics
  • Molecular Electronics
  • Quantum Chemistry

Background:

  • The chirality-induced spin-selectivity (CISS) effect describes spin-polarized currents generated by electron transport through chiral molecules.
  • Existing theories often rely on unrealistically strong spin-orbit interactions within the molecule itself.

Purpose of the Study:

  • To develop a new theoretical framework for the CISS effect that aligns with experimental observations using realistic parameters.
  • To explain the origin of spin polarization in chiral molecular junctions.

Main Methods:

  • Development of a phenomenological theory incorporating electrode spin-orbit interactions, molecular chirality-induced solenoid fields, and interface spin-transfer torque.
  • Mean-field calculations performed on simplified models of molecular junctions.

Main Results:

  • The proposed theory qualitatively reproduces key experimental findings of the CISS effect.
  • The model successfully accounts for the magnitude of the CISS effect with realistic physical parameters.
  • Demonstrated that the interplay between electrode properties and molecular chirality is crucial.

Conclusions:

  • The new theory provides a more plausible explanation for the CISS effect, shifting focus from intramolecular to interfacial and electrode effects.
  • The findings suggest that careful engineering of electrode materials and molecular interfaces can control spin polarization.
  • The study offers testable predictions for future experimental validation.