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CISS effect: Magnetocurrent-voltage characteristics with Coulomb interactions. II.

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CISS Effect: A Magnetoresistance Through Inelastic Scattering.

Karssien Hero Huisman1, Joseph Marie Thijssen1

  • 1Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|November 5, 2021
PubMed
Summary
This summary is machine-generated.

Chirality-induced spin selectivity causes magnetoresistance in molecular junctions. Inelastic scattering is necessary for magnetoresistance, but spin-orbit coupling alone cannot explain experimental results.

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Spintronics

Background:

  • Chirality-induced spin selectivity (CISS) is a phenomenon where chiral molecules induce spin polarization in charge transport.
  • Magnetoresistance (MR) is observed in two-terminal transport measurements of molecular junctions, but its origin is debated.
  • Spin-orbit coupling in leads and inelastic scattering are potential factors influencing CISS and MR.

Purpose of the Study:

  • Investigate the role of spin-orbit coupling in the leads on transmission polarization.
  • Determine the conditions under which magnetoresistance occurs in molecular junctions.
  • Clarify the contribution of inelastic scattering to magnetoresistance in chiral molecular systems.

Main Methods:

  • Utilized a tight-binding model to study a helicene molecule sandwiched between gold contacts.
  • Incorporated inelastic scattering effects using Büttiker probes to circumvent limitations of coherent transport.
  • Analyzed both linear and nonlinear transport regimes to assess magnetoresistance.

Main Results:

  • Strictly two-terminal systems without inelastic scattering exhibit zero magnetoresistance.
  • Nonzero magnetoresistance, up to 0.1%, appears in the nonlinear regime when inelastic scattering is present.
  • Spin-orbit coupling in leads combined with inelastic scattering does not fully account for experimentally observed magnetoresistance magnitudes.

Conclusions:

  • Inelastic scattering is essential for obtaining nonzero magnetoresistance in two-terminal systems respecting time-reversal symmetry and charge conservation.
  • The current theoretical model, including spin-orbit coupling and inelastic scattering, is insufficient to explain the magnitude of experimentally measured magnetoresistance.
  • Further research is needed to fully understand the mechanisms behind large magnetoresistance in chiral molecular junctions.