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Spin-Selective Electron Transport Through Single Chiral Molecules.

Mohammad Reza Safari1,2, Frank Matthes1,2, Claus M Schneider1,2,3

  • 1Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425, Jülich, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|December 5, 2023
PubMed
Summary
This summary is machine-generated.

Chirality-induced spin selectivity (CISS) shows spin-polarized electron transport in single helical molecules. This study reveals magnetochiral conductance asymmetries, ruling out common mechanisms for CISS.

Keywords:
CISS effectchiralityferromagnetic substratescanning probe microscopysingle‐molecule studies

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Chirality and magnetism interplay has long fascinated scientists.
  • Chirality-induced spin selectivity (CISS) is a phenomenon where electron transport through chiral molecules results in spin polarization.
  • Despite experimental evidence, the precise mechanism of CISS remains unclear.

Purpose of the Study:

  • To investigate spin-selective electron transport in single helical aromatic hydrocarbons.
  • To explore the magnetochiral conductance asymmetry in chiral molecular systems.
  • To elucidate the underlying mechanism of CISS by ruling out alternative explanations.

Main Methods:

  • Spin-polarized scanning tunneling microscopy (SP-STM) was employed.
  • Single helical aromatic hydrocarbons were deposited on ferromagnetic cobalt surfaces under vacuum.
  • Measurements were conducted at 5 K, comparing enantiomers under identical conditions.

Main Results:

  • Significant magnetochiral conductance asymmetries (up to 50%) were observed.
  • Asymmetries were modulated by changing molecular handedness or reversing magnetization of the tip/substrate.
  • The findings exclude electron-phonon coupling and ensemble effects as primary CISS mechanisms.

Conclusions:

  • Single helical molecules exhibit pronounced spin-selective transport.
  • The study provides direct evidence for magnetochiral effects in chiral molecular systems.
  • This work advances the understanding of CISS mechanisms at the single-molecule level.