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

  • Author(s): Eckshtain-Levi, Meital;
  • Capua, Eyal;
  • Refaely-Abramson, Sivan;
  • Sarkar, Soumyajit;
  • Gavrilov, Yulian;
  • Mathew, Shinto P;
  • Paltiel, Yossi;
  • Levy, Yaakov;
  • Kronik, Leeor;
  • Naaman, Ron
  • et al.
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.

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