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Updated: Jun 17, 2025
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
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Chirality-Induced Magnetic Polarization by Charge Localization in a Chiral Supramolecular Crystal.
Michael Verhage1, Pantelis Bampoulis2, Marco D Preuss3,4
1Molecular Materials and Nanosystems - Department of Applied Physics, Eindhoven University of Technology, Eindhoven, 5600 MB, The Netherlands.
Advanced Materials (Deerfield Beach, Fla.)
|August 14, 2024
Summary
Chirality-induced spin selectivity (CISS) in (S)-CBI-GCH crystals arises from dynamic charge transport and Fano resonances. This study reveals how charge localization and delocalization influence spin-polarized currents and magnetochiral effects.
Area of Science:
- Molecular electronics
- Spintronics
- Organic electronics
Background:
- Chirality-induced spin selectivity (CISS) links molecular structure to electron spin polarization.
- Conductive AFM is commonly used to measure spin-filtering magnitude.
Purpose of the Study:
- Investigate current-voltage (I-V) spectra dynamics in chiral (S)-CBI-GCH crystals.
- Elucidate the origin of superimposed peaks and Fano resonances in I-V curves.
- Introduce a novel mechanism for spin-polarized charge transport in CBI-GCH.
Main Methods:
- Analysis of dynamic voltage-sweep rate-dependent current-voltage (I-V) spectra.
- Study of chiral crystals of imide-substituted coronene bisimide ((S)-CBI-GCH).
- Investigation of charge localization and delocalization effects on transport.
Main Results:
- Complex I-V curves attributed to dynamic voltage-sweep rate-dependent phenomena.
- Fano resonances observed due to interference between localized redox states and π-π stacking.
- A new mechanism for dynamic transport explains spin-polarized charge in crystallized (S)-CBI-GCH.
- Charge trapping modifies injection barriers, influencing tunneling transport and CISS nonlinearity.
Conclusions:
- Interference between charge localization and delocalization is key to understanding magnetochiral phenomena.
- Transient charge polarization guides spin-polarized charge in (S)-CBI-GCH on metallic substrates.
- Charge trapping effects demonstrate nonlinearity in CISS for coronene bisimide derivatives.
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