Role of Exchange Interactions in the Magnetic Response and Intermolecular Recognition of Chiral Molecules

Arezoo Dianat*, Rafael Gutierrez*, Hen Alpern, Vladimiro Mujica, Amir Ziv, Shira Yochelis, Oded Millo, Yossi Paltiel, Gianaurelio Cuniberti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The physical origin of the so-called chirality-induced spin selectivity (CISS) effect has puzzled experimental and theoretical researchers over the past few years. Early experiments were interpreted in terms of unconventional spin-orbit interactions mediated by the helical geometry. However, more recent experimental studies have clearly revealed that electronic exchange interactions also play a key role in the magnetic response of chiral molecules in singlet states. In this investigation, we use spin-polarized closed-shell density functional theory calculations to address the influence of exchange contributions to the interaction between helical molecules as well as of helical molecules with magnetized substrates. We show that exchange effects result in differences in the interaction properties with magnetized surfaces, shedding light into the possible origin of two recent important experimental results: enantiomer separation and magnetic exchange force microscopy with AFM tips functionalized with helical peptides.

Original languageAmerican English
Pages (from-to)7077-7086
Number of pages10
JournalNano Letters
Volume20
Issue number10
DOIs
StatePublished - 14 Oct 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Keywords

  • CISS effect
  • Density-Functional Theory
  • Exchange Effects
  • Helical Molecules
  • broken symmetry

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