H
Helmut Zacharias
Researcher at University of Münster
Publications - 274
Citations - 6400
Helmut Zacharias is an academic researcher from University of Münster. The author has contributed to research in topics: Laser & Excited state. The author has an hindex of 40, co-authored 268 publications receiving 5698 citations. Previous affiliations of Helmut Zacharias include Bielefeld University & Free University of Berlin.
Papers
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Journal ArticleDOI
Spin selectivity in electron transmission through self-assembled monolayers of double-stranded DNA.
Benjamin Göhler,Volker Hamelbeck,Tal Z. Markus,Matthias Kettner,G. F. Hanne,Zeev Vager,Ron Naaman,Helmut Zacharias +7 more
TL;DR: Spin selectivity at room temperature was extremely high as compared with other known spin filters, and the spin filtration efficiency depended on the length of the DNA in the monolayer and its organization.
Journal ArticleDOI
Electronic structure of spatially aligned graphene nanoribbons on Au(788).
Steffen Linden,Dingyong Zhong,Alexander Timmer,Nabi Aghdassi,Jörn-Holger Franke,Hai-Ming Zhang,Xinliang Feng,Klaus Müllen,Harald Fuchs,Harald Fuchs,Lifeng Chi,Helmut Zacharias +11 more
TL;DR: High-resolution direct and inverse photoemission spectroscopy of occupied and unoccupied states allows the determination of the energetic position and momentum dispersion of electronic states revealing the existence of band gaps of several electron volts for straight 7-armchairs, 13-armchair, and chevron-type GNRs in the electronic structure.
Journal ArticleDOI
Spin-dependent electron transmission through bacteriorhodopsin embedded in purple membrane
Debabrata Mishra,Tal Z. Markus,Ron Naaman,Matthias Kettner,Benjamin Göhler,Helmut Zacharias,Noga Friedman,Mordechai Sheves,Claudio Fontanesi +8 more
TL;DR: clear evidence for spin-dependent electron transmission through this system and a strong dependence of the conduction on the protein’s structure point to the possibility that the effect may play a role in electron transfer in biological systems.
Journal ArticleDOI
Spin Filtering in Electron Transport Through Chiral Oligopeptides
Matthias Kettner,Benjamin Göhler,Helmut Zacharias,Debabrata Mishra,Vankayala Kiran,Ron Naaman,Claudio Fontanesi,David H. Waldeck,Slawomir Sek,Jan Pawlowski,Joanna Juhaniewicz +10 more
TL;DR: In this paper, the dependence of spin selectivity on the molecular length is measured in an electrochemical cell for bound electrons and in a photoemission spectrometer for photoelectrons.