Inverse chirality-induced spin selectivity effect in chiral assemblies of π-conjugated polymers

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Abstract
Coupling of spin and charge currents to structural chirality in non-magnetic materials, known as chirality-induced spin selectivity, is promising for application in spintronic devices at room temperature. Although the chirality-induced spin selectivity effect has been identified in various chiral materials, its Onsager reciprocal process, the inverse chirality-induced spin selectivity effect, remains unexplored. Here we report the observation of the inverse chirality-induced spin selectivity effect in chiral assemblies of π-conjugated polymers. Using spin-pumping techniques, the inverse chirality-induced spin selectivity effect enables quantification of the magnitude of the longitudinal spin-to-charge conversion driven by chirality-induced spin selectivity in different chiral polymers. 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 inverse chirality-induced spin selectivity effect suggests possibilities for elucidating the puzzling interplay between spin and chirality, and opens a route for spintronic applications using printable chiral assemblies.
Funding Information
  • U.S. Department of Energy (DE-SC0020992)
  • National Science Foundation (DMR-2143642, DMR-1720633, DMR-1847828)
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (FA9550-23-1-0311, FA9550-23-1-0311, FA9550-23-1-0311, FA9550-22-P-0014, FA9550-23-1-0311, FA9550-23-1-0311, FA9550-23-1-0311)
  • United States Department of Defense | United States Navy | Office of Naval Research (N00014-20-1-2181, N00014-2220-1-2202)

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