Chirality-Induced Magnetic Polarization by Charge Localization in a Chiral Supramolecular Crystal

Michael Verhage, Pantelis Bampoulis, Marco D. Preuss, Ivo Filot, Rick R.M. Joosten, Heiner Friedrich, E.W. Meijer, Kees Flipse (Corresponding author)

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Abstract

The chirality-induced spin selectivity (CISS) effect is a fascinating phenomenon that correlates the molecular structure with electron spin-polarization (SP). Experimental procedures to quantify the spin-filtering magnitude have extensively used magnetic-field-dependent conductive AFM. In this work chiral crystals of imide-substituted coronene bisimide ((S)-CBI-GCH) are studied to explain the dynamics of the current–voltage I − V spectra and the origin of superimposed peaks are investigated. A dynamic voltage-sweep rate-dependent phenomenon can give rise to complex I − V curves. The redox group, capable of localization of charge, acts as a localized state that interferes with the continuum of the π – π stacking, giving rise to Fano resonances. A novel mechanism for dynamic transport is introduced, which provides insight into the origin of spin-polarized charge in crystallized CBI-GCH molecules after absorption on a metallic substrate, guided by transient charge polarization. Crucially, interference between charge localization and delocalization during transport may be important properties in understanding the magnetochiral phenomena observed by electrostatic force microscopy. Finally, it is observed that charge trapping sensitively modifies the injection barrier from direct tunneling to Fowler–Nordheim tunneling transport supporting nonlinearity in CISS for this class of molecules.

Original languageEnglish
Article number2403807
Number of pages11
JournalAdvanced Materials
Volume36
Issue number41
Early online date13 Aug 2024
DOIs
Publication statusPublished - 10 Oct 2024

Funding

The authors thank Chidambar Kulkarni for the synthesis of CBI\u2010GCH supramolecular polymers. The authors thank Omur Gokni\u00E7ar for assistance with the AFM experiments and Riccardo Ollearo for fabrication of the ITO/Au substrates. The authors thank Mark de Jong for support with the Bruker PeakForce AFM. Funding is acknowledged from the Eindhoven University of Technology and the European Commission Research Executive Agency (Grant Agreement Number: 859752 HEL4CHIROLED H2020\u2010MSCA\u2010ITN\u20102019).

FundersFunder number
Eindhoven University of Technology
European Commission Research Executive Agency859752 HEL4CHIROLED H2020‐MSCA‐ITN‐2019

    Keywords

    • charge localization
    • chiral
    • CISS
    • Fano resonance
    • interference

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