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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Tuesday, 24 October 2013
(at 13:00 in room HAL 115)
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Organized helical molecules as effective electron spin filters

Helmut Zacharias

Westfälische Wilhelms-Universität Münster

In electron transfer processes, spin effects are usually seen either in magnetic materials or in systems containing heavy atoms that facilitate spin-orbit coupling. Here we present spin-selective transmission of electrons through self-assembled monolayers of double-stranded DNA on gold and bacteriorhodopsin on gold and aluminum. In these experiments we show that electrons photoemitted from a substrate surface and transmitted through a monolayer of self-assembled chiral double-stranded DNA and bacteriorhodpsin molecules are highly spin-polarized. Since photoelectrons excited by linearly polarized, normally incident light on a gold surface are not spin polarized, these molecules act as very efficient spin filters achieving a polarization of up to 60% (DNA) [1] and 22% for bacteriorhodopsin. Because of the low

Brief Bio:

Prof. Zacharias studied Physics and Biophysics in Hannover, finished his Dissertation (1978) and Habilitation (1984) in Bielefeld. He was visiting Scientist at IBM, Yorktown Heights, (1981-83,1984,1988) and Heisenberg Fellow (1986 – 89). In 1989 he became Professor in Essen and since 1996 in Münster. Current reseach interest concentrate on ultrafast electron dynamics in 2D systems, electronic interaction in organic adsorbates, and processes related to photon-induced reactions on and in cold molecular ices, relevant for the interstellar medium. Activities in connection with Free Electron Lasers (FLASH, XFEL) concern the development of x-ray split-and-delay units for x-ray pump-probe experiments.

Announcement (pdf)

Invited by G. Cuniberti

Within the nanoSeminar

last modified: 2021.10.21 Thu
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