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%.
|Number of pages||6|
|Journal||Physical Chemistry Chemical Physics|
|State||Published - 22 Jan 2020|
Bibliographical noteFunding Information:
We gratefully acknowledge funding from the Templeton Foundation, the Swiss National Science Foundation (Grants 200021-160182 and 200020-169515) and the Rothschild Caesarea Foundation, Caesarea Business Park, 38900 Caesarea, Israel (Grant 6115).
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