The chiral induced spin selectivity effect (CISS) is the finding that the motion of an electron within or through chiral systems depends on the spin of that electron. A manuscript describing the spin dependent transport of photoelectrons through chiral monolayers was first published in 1999;1 however, only when a paper describing the direct measurement of the transmitted electrons spin appeared did the subject begin to catch the attention of the broader scientific community.2 Although the effect has been observed by many research groups experimentally and the results obtained are consistent with each other, developing a quantitative theoretical description has been a struggle.3 To obtain the large spin polarizations determined experimentally, many theoretical approaches require one to introduce a spin–orbit coupling (SOC) magnitude that is much larger than that typically found from spectroscopy experiments. Other issues relating to the applicability of the Onsager reciprocity principle and the implications...

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