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Efficient Spin Selectivity in Self-Assembled Superhelical Conducting Polymer Microfibers.

Lei Jia1,2, Chenchen Wang1,3, Yuchun Zhang1

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

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Summary

Chiral polyaniline microfibers demonstrate efficient spin selectivity in microscale devices, a key advance for organic spintronics. This chirality-induced spin selectivity (CISS) effect was observed in ordered helical structures at room temperature.

Keywords:
chiralityconducting polymercrystallineself-assemblyspin selectivity

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Area of Science:

  • Organic spintronics
  • Materials science
  • Condensed matter physics

Background:

  • Chiral materials have been studied for over a century.
  • Chirality-induced spin selectivity (CISS) effect links electron transmission and molecular chirality.
  • CISS effect has been primarily demonstrated in molecular-scale devices.

Purpose of the Study:

  • To explore the CISS effect in microscale devices.
  • To investigate spin selectivity in self-assembled superhelical conducting polyaniline (PANI) microfibers.
  • To understand the role of molecular ordering in CISS.

Main Methods:

  • Fabrication of microscale devices using self-assembled superhelical PANI microfibers.
  • Measurement of spin-selective efficiency in helical channels (2-6 μm length) at room temperature.
  • Theoretical rationalization using an extended Su-Schrieffer-Heeger model incorporating Rashba spin-orbit coupling.

Main Results:

  • Achieved spin-selective efficiency up to 80% in microscale PANI devices.
  • Demonstrated that long-range ordering of chiral PANI molecules is crucial for efficient spin selectivity.
  • Observed no selective transmission in "amorphous" chiral PANIs.

Conclusions:

  • Efficient spin selectivity can be achieved in microscale devices using ordered, self-assembled chiral materials.
  • The CISS effect in PANI microfibers is dependent on molecular ordering.
  • Results inspire the use of molecularly ordered, chiral π-conjugated materials for organic spintronics.