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Spin-Charge Conversion in Chiral Polymers with Hopping Conduction.

Zhi-Gang Yu1

  • 1Sivananthan Laboratories, Bolingbrook, Illinois 60440, United States.

The Journal of Physical Chemistry Letters
|July 24, 2024
PubMed
Summary
This summary is machine-generated.

Chiral polymers enable spin-charge conversion via a novel microscopic theory. Chirality-induced spin selectivity (CISS) and inverse CISS (ICISS) are explained by geometric spin-orbit coupling and spin-flip hopping in disordered organic materials.

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Area of Science:

  • Organic electronics
  • Spintronics
  • Polymer science

Background:

  • Chiral materials exhibit spin-charge conversion, known as chirality-induced spin selectivity (CISS) and inverse CISS (ICISS).
  • Existing theories explain CISS/ICISS in crystalline systems using band structure, but this fails for disordered chiral polymers with hopping transport.

Purpose of the Study:

  • To develop a microscopic theory for CISS and ICISS in disordered chiral organic materials.
  • To elucidate the role of geometric spin-orbit coupling and spin-flip hopping in these phenomena.

Main Methods:

  • Development of a microscopic theory based on electron hops involving chiral triads.
  • Incorporation of chirality-induced geometric spin-orbit coupling and Berry phase effects.
  • Analysis of the influence of spin-flip hopping on CISS and ICISS.

Main Results:

  • The theory explains CISS and ICISS in disordered chiral polymers through geometric spin-dependent Berry phases.
  • Chirality-induced geometric spin-orbit coupling is identified as a key mechanism.
  • Spin-flip hopping is shown to suppress CISS while enabling ICISS.

Conclusions:

  • A new theoretical framework successfully describes spin-charge conversion in disordered chiral polymers.
  • Geometric effects and spin-flip hopping are crucial for understanding CISS and ICISS in these materials.
  • This work provides insights into the spintronic properties of organic materials.