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Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance

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Abstract

Chirality-induced spin selectivity is evidenced by exciting the spin resonance of radicals in an electrochemical cell where the working electrode is covered with a chiral self-assembled monolayer. Because the electron transfer to and from the paramagnetic radical is spin dependent, the electrochemical current changes at resonance. This electrically-detected magnetic resonance (EDMR) is monitored by a lock-in detection based on electrode voltage modulation, at a frequency that optimizes the sensitivity of the differential conductance to the electrode charge transfer process. The method is validated using p-doped GaAs electrodes in which the conduction band electrons are hyperpolarized by a well-known method of optical spin pumping with circularly polarized light. Gold electrodes covered with peptides consisting of 5 alanine groups (Al5) present a relative current change of up to 5 × 10−5 when the resonance condition is met, corresponding to a spin filtering efficiency between 6 and 19%.

Graphical abstract: Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance

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Publication details

The article was received on 23 Aug 2019, accepted on 16 Oct 2019 and first published on 28 Oct 2019


Article type: Paper
DOI: 10.1039/C9CP04681J
Phys. Chem. Chem. Phys., 2020, Advance Article
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    Spin-dependent charge transfer at chiral electrodes probed by magnetic resonance

    F. Blumenschein, M. Tamski, C. Roussel, E. Z. B. Smolinsky, F. Tassinari, R. Naaman and J. Ansermet, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP04681J

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