Spin selectivity in electron transmission through self-assembled monolayers of double-stranded DNA.
Science
; 331(6019): 894-7, 2011 Feb 18.
Article
em En
| MEDLINE
| ID: mdl-21330541
ABSTRACT
In electron-transfer processes, spin effects normally are seen either in magnetic materials or in systems containing heavy atoms that facilitate spin-orbit coupling. We report spin-selective transmission of electrons through self-assembled monolayers of double-stranded DNA on gold. By directly measuring the spin of the transmitted electrons with a Mott polarimeter, we found spin polarizations exceeding 60% at room temperature. The spin-polarized photoelectrons were observed even when the photoelectrons were generated with unpolarized light. The observed spin selectivity at room temperature was extremely high as compared with other known spin filters. The spin filtration efficiency depended on the length of the DNA in the monolayer and its organization.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
DNA
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Elétrons
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Ouro
Idioma:
En
Revista:
Science
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Alemanha