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

Felix Blumenschein, Mika Tamski, Christophe Roussel, Eilam Z.B. Smolinsky, Francesco Tassinari, Ron Naaman, Jean Philippe Ansermet

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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%.

Original languageEnglish
Pages (from-to)997-1002
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume22
Issue number3
DOIs
StatePublished - 22 Jan 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
This journal is © the Owner Societies.

Funding

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).

FundersFunder number
Caesarea Business Park6115
John Templeton Foundation
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung200021-160182, 200020-169515
Rothschild Caesarea Foundation

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