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The Chiral Induced Spin Selectivity Effect (CISS)

Date: Tuesday, September 18, 2018 11:00 - 12:30
Speaker: Yossi Paltiel (Hebrew University)
Location: Big Seminar room Ground floor / Office Bldg West (I21.EG.101)
Series: Physical Sciences Seminar
Host: Misha Lemeshko
Lab building west seminar room


Living organisms rely on chiral molecules, such as nucleic acids and proteins. A chiral molecule is not superimposable on its mirror image, also known as its enantiomer, just like our right hand cannot be superimposed on our left hand. Organisms contain only one enantiomeric form of a molecule, a selectivity that has prevailed through evolution. We claim that the chiral induced spin selectivity (CISS) effect can explain why enantiomeric purity might provide an advantage in biology. CISS is an electronic phenomenon in which electron transmission through chiral molecules depends on the direction of the electron spin, a quantum mechanical property associated with its magnetic moment. Thus charge displacement and transmission in chiral molecules generates a spin-polarized electron distribution. This effect; enhance electron transfer in proteins, enable nano metric charge separation, and explain biorecognition.From the applicational point, by utilizing the CISS effect we demonstrated a magnet less spin based nano magnetic optical and electrical memory. To further enhance efficiency, we also investigated the interface between superconducting thin films and the magnetic layers improving and simplifying superconducting spintronics devices. The presented technology has the potential to overcome the limitations of other magnetic-based memory technologies to allow fabricating inexpensive, high-density universal and embedded memory-on-chip devices. Lastly, using magnetic ferromagnetic surfaces we have shown a simple generic ways to seperate between two enantiomers. Achieving enantiopurity is of great importance to many industrial fields. This enantiospecific interaction is controled by surface magnetization and the chirality of oligopeptides, oligonucleotides, and amino acids.In my talk I will presnt the CISS effect and its importence, both for applications and basic science. I will also point to open questions reagrding the CISS.
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