Detection of a Chirality-Induced Spin Selective Quantum Capacitance in α‑Helical Peptides

Advanced Kelvin probe force microscopy simultaneously detects the quantum capacitance and surface potential of an α-helical peptide monolayer. These indicators shift when either the magnetic polarization or the enantiomer is toggled. A model based on a triangular quantum well in thermal and chemical...

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Bibliographic Details
Published inNano letters Vol. 23; no. 17; pp. 8280 - 8287
Main Authors Theiler, Pius Markus, Ritz, Christian, Hofmann, Raphael, Stemmer, Andreas
Format Journal Article
LanguageEnglish
Published American Chemical Society 13.09.2023
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Summary:Advanced Kelvin probe force microscopy simultaneously detects the quantum capacitance and surface potential of an α-helical peptide monolayer. These indicators shift when either the magnetic polarization or the enantiomer is toggled. A model based on a triangular quantum well in thermal and chemical equilibrium and electron–electron interactions allows for calculating the electrical potential profile from the measured data. The combination of the model and the measurements shows that no global charge transport is required to produce effects attributed to the chirality-induced spin selectivity effect. These experimental findings support the theoretical model of Fransson et al. Nano Letters 2021, 21 (7), 3026–3032. Measurements of the quantum capacitance represent a new way to test and refine theoretical models used to explain strong spin polarization due to chirality-induced spin selectivity.
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content type line 23
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.3c02483