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Linear and Nonlinear Two-Terminal Spin-Valve Effect from Chirality-Induced Spin Selectivity.

Tianhan Liu1, Xiaolei Wang2, Hailong Wang2

  • 1Department of Physics, Florida State University, Tallahassee, Florida 32306, United States.

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|November 2, 2020
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Summary

Chirality-induced spin selectivity (CISS) enables spin filtering in nonmagnetic materials. This study definitively observes CISS magnetoconductance in semiconductor heterojunctions, verifying spin filtering and enabling new spintronic devices.

Keywords:
chirality-induced spin selectivitymagnetic semiconductormagnetoconductancemolecular junctionmolecular spintronicsspin-valve effect

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Chirality-induced spin selectivity (CISS) is a mechanism for generating spin polarization in nonmagnetic materials.
  • CISS causes different electrical conductivities for opposite electron spins due to structural chirality.
  • The microscopic origins and transport mechanisms of CISS remain debated, with concerns about detecting linear-response CISS using ferromagnets.

Purpose of the Study:

  • To definitively observe and verify spin filtering by chiral molecules using CISS.
  • To investigate the bias dependence of CISS-induced magnetoconductance.
  • To provide constraints for theories of CISS and its device applications.

Main Methods:

  • Fabrication of vertical heterojunctions using (Ga,Mn)As/AHPA-L molecules/Au.
  • Measurement of magnetoconductance in the heterojunctions.
  • Analysis of the bias dependence of the observed signals.

Main Results:

  • Definitive observation of CISS-induced magnetoconductance in (Ga,Mn)As/AHPA-L molecules/Au heterojunctions.
  • Verification of spin filtering by AHPA-L molecules, detected by (Ga,Mn)As.
  • Identification of both linear- and nonlinear-response components in the bias dependence.
  • Confirmation of a linear-response CISS-induced two-terminal spin-valve effect.

Conclusions:

  • The study provides definitive evidence for spin filtering via CISS in semiconductor heterojunctions.
  • The findings validate the use of magnetic semiconductors for robust CISS detection.
  • The results offer a promising pathway for spin injection and detection in semiconductors without magnetic materials, impacting spintronic device development.