Publication date: 28th August 2024
The chiral induced spin selectivity (CISS) effect means that electron transport through chiral systems is spin dependent. [1] The effect was found to exist not only on molecular scale but also in crystals when the scale of the spin transport exceeds microns. In addition, in many cases, the effect was found to increase with increasing temperatures. Recent studies on electron transfer (ET) through proteins established that the effect is indeed long range and with extremely high spin selectivity, reaching 100%.[2]
Experimental results obtained on long range CISS effect will be presented and the dilemma they present will be discussed. Since the CISS effect involves also charge transfer, its mechanism must reflect the ET process. Experimental results will be presented that indicate that the CISS effect cannot be explained based on a single electron and Born-Oppenheimer based models.
It will be shown that models that are not based on these approximations can provide qualitative understanding of the CISS, although real first principle calculations remain a major challenge.
Keywords: Chirality, spin, electron transport
R. Naaman, Y. Paltiel, D. H. Waldeck, Annu. Rev. Biophys. 2022, 51, 99.
S. Ghosh, K Banerjee-Ghosh, D. Levy, D. Scheerer, I. Riven, J. Shin, H. B. Gray, R. Naaman, G. Haran, PNAS 119, 2022, e2204735119.
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