Perspective highlights difficulties in defining the electron transfer mechanism in chiral systems, suggesting a need for new theories.
This perspective explains why theoreticians struggle to develop a comprehensive mechanism for the chiral-induced spin selectivity (CISS) effect. The effect and experimental results are described, with emphasis on how spin-dependent transport through chiral systems differs from the commonly described electron transfer through linear systems. The missing elements in the conventional theories of electron transfer are identified, and experiments justifying the importance of these elements are presented.
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Naaman et al. (2026) studied this question.
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