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The Chirality Induced Spin Selectivity (CISS) Effect- From Spintronics to Electron Transfer in Biology

by Prof. Ron Naaman (Department of Chemical Physics, Weizmann Institute, Israel)

→ Asia/Kolkata
AG-66

AG-66
Description
Spin based properties, applications, and devices are commonly related to magnetic effects and to magnetic materials. Hence, most of the development in spintronics is currently based on inorganic materials. Despite the fact that the magnetoresistance effect has been observed in organic materials, until now spin selectivity of organic based spintronics devices originated from an inorganic ferromagnetic electrode and was not determined by the organic molecules themselves. In several studies, however, we found that chiral organic molecules can act as spin filter for photoelectrons transmission, in electron transfer, and in electron transport.[1]  
I will present results from several recent experiments demonstrating the CISS effect and devices based upon. It will be shown that spin polarization exceeding 80% can be obtained. Among others, I will discuss the importance of spin in electron transfer through proteins[2] and through bio-systems, like the photosystem,[3] and new type of spintronics devices and magnetic memory without permanent magnet.

[1] R. Naaman, D.H. Waldeck, The Chiral Induced Spin Selectivity Effect, J. Phys. Chem. Lett. (feature) 3, 2178−2187 (2012).
[2] D. Mishra, T.Z. Markus, R. Naaman, M. Kettner, B. Göhler, H. Zacharias, N. Friedman, M. Sheves, C. Fontanesi, Spin-Dependent Electron Transmission through Bacteriorhodopsin Embedded in Purple Membrane, PNAS,   110 (37) 14872-14876 (2013).
[3] I.i Carmeli, K. S. Kumar, O. Hieflero, C. Carmeli, R. Naaman, Spin Selectivity in Electron Transfer in Photosystem I, Angew. Chemie  53, 8953 –8958 (2014).



About Prof. Ron Naaman:

Born in Israel, Prof. Naaman earned his BSc in 1973 from Ben-Gurion University of the Negev, and his PhD in 1978 from the Weizmann Institute of Science. He worked as a postdoctoral researcher at Stanford University in California, and spent a year as a Lecturer and Research Associate in the Department of Chemistry at Harvard University. In 1981, Prof. Naaman joined the Weizmann Institute. From 1989-1995, Prof. Naaman chaired the Institute’s Chemical Services Unit and from 1995-2000, he headed the Department of Chemical Physics. From 2008-2010, Prof. Naaman was the Chair of the Scientific Council at the Institute. Prof. Naaman heads the Nancy and Stephen Grand Research Center for Sensors and Security. He is the incumbent of the Aryeh and Mintzi Katzman Professorial Chair.

Prof. Naaman studies the electronic properties of organic-inorganic interfaces. He investigates the interaction of electrons with self-assembled monolayers and the electronic interactions within these hybrid structures. His group discovered the Chiral Induced Spin Selectivity (CISS) effect and is utilizing this effect for a new type of electronic which is spin dependent. Prof. Naaman is a fellow of the American Physical Society. In 2007, he was the Lectureship Award Winner of the Division of Colloid and Surface Chemistry of the Chemical Society of Japan. From 2008-2011, he was a member of the advisory board of the Journal of Physical Chemistry. In 2011 he received the Erasmus Mundus research scholarship at the Technical University Dresden. In 2011, he was also the recipient of the Israel Vacuum Society Research Excellence Prize, and is a member of the editorial board of the Beilstein Journal of Nanotechnology and the advisory editorial board of Physical Chemistry Chemical Physics Journal.


 


Slides