Title: Interplays of Structural Chirality and Spin Phenomena in Chiral Matters

Abstract: Coupling of spin and charge currents to structural chirality in non-magnetic materials, known as chirality-induced spin selectivity (CISS), is promising for application in spintronic devices at room temperature. Although the CISS effect has been identified in various chiral materials, its
Onsager reciprocal process, the inverse CISS (ICISS) effect remains unexplored. Here we will talk about the observation of the ICISS effect in chiral assemblies of π-conjugated polymers. Using spin-pumping techniques, the ICISS effect enables quantification of the magnitude of the CISS-driven longitudinal spin-to-charge conversion in different chiral polymers. The sign of the ICISS effect depends on the chirality of the polymers and occurs solely when the injected spin polarization aligns with the chiral axis. It’s attributed to an unconventional spin orbit coupling related to the structural-chirality-induced Berry curvature leading to a linear spin-to-charge conversion. By widely tuning conductivities and supramolecular chiral structures via a printing method, we found a very long spin relaxation time of up to several nanoseconds parallel to the chiral axis. Our demonstration of the ICISS effect opens possibilities for elucidating the puzzling interplay between spin and chirality, and opens a route for spintronic applications using printable chiral assemblies.