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Recent research discovered that charge transfer processes in chiral moleculescan be spin selective and named the effect chiral-induced spin selectivity(CISS). Follow-up work studied hybrid spintronic devices with conventionalelectronic materials and chiral (bio)molecules. However, a theoreticalfoundation for the CISS effect is still in development and the spintronicsignals were not evaluated quantitatively. We present a circuit-model approachthat can provide quantitative evaluations. Our analysis assumes the scheme of arecent experiment that used photosystem~I (PSI) as spin injectors, for which wefind that the experimentally observed signals are, under any reasonableassumptions on relevant PSI time scales, too high to be fully due to the CISSeffect. We also show that the CISS effect can in principle be detected usingthe same type of solid-state device, and by replacing silver with graphene, thesignals due to spin generation can be enlarged four orders of magnitude. Ourapproach thus provides a generic framework for analyzing this type ofexperiments and advancing the understanding of the CISS effect.

Circuit-Model Analysis for Spintronic Devices with Chiral Molecules as Spin Injectors