Cold denaturation induces inversion of dipole and spin transfer in chiral peptide monolayers

Meital Eckshtain-Levi, Eyal Capua, Sivan Refaely-Abramson, Soumyajit Sarkar, Yulian Gavrilov, Shinto P. Mathew, Yossi Paltiel, Yaakov Levy, Leeor Kronik and Ron Naaman ()
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Meital Eckshtain-Levi: Weizmann Institute of Science
Eyal Capua: Weizmann Institute of Science
Sivan Refaely-Abramson: Weizmann Institute of Science
Soumyajit Sarkar: Weizmann Institute of Science
Yulian Gavrilov: Weizmann Institute of Science
Shinto P. Mathew: Weizmann Institute of Science
Yossi Paltiel: The Hebrew University
Yaakov Levy: Weizmann Institute of Science
Leeor Kronik: Weizmann Institute of Science
Ron Naaman: Weizmann Institute of Science

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Chirality-induced spin selectivity is a recently-discovered effect, which results in spin selectivity for electrons transmitted through chiral peptide monolayers. Here, we use this spin selectivity to probe the organization of self-assembled α-helix peptide monolayers and examine the relation between structural and spin transfer phenomena. We show that the α-helix structure of oligopeptides based on alanine and aminoisobutyric acid is transformed to a more linear one upon cooling. This process is similar to the known cold denaturation in peptides, but here the self-assembled monolayer plays the role of the solvent. The structural change results in a flip in the direction of the electrical dipole moment of the adsorbed molecules. The dipole flip is accompanied by a concomitant change in the spin that is preferred in electron transfer through the molecules, observed via a new solid-state hybrid organic–inorganic device that is based on the Hall effect, but operates with no external magnetic field or magnetic material.

Date: 2016
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DOI: 10.1038/ncomms10744

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