Effect of Chiral Molecules on the Electron's Spin Wavefunction at Interfaces

Supriya Ghosh, Suryakant Mishra, Eytan Avigad, Brian P. Bloom, L. T. Baczewski, Shira Yochelis, Yossi Paltiel*, Ron Naaman, David H. Waldeck

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Kelvin-probe measurements on ferromagnetic thin film electrodes coated with self-Assembled monolayers of chiral molecules reveal that the electron penetration from the metal electrode into the chiral molecules depends on the ferromagnet's magnetization direction and the molecules' chirality. Electrostatic potential differences as large as 100 mV are observed. These changes arise from the applied oscillating electric field, which drives spin-dependent charge penetration from the ferromagnetic substrate to the chiral molecules. The enantiospecificity of the response is studied as a function of the magnetization strength, the magnetization direction, and the handedness and length of the chiral molecules. These new phenomena are rationalized in terms of the chiral-induced spin selectivity (CISS) effect, in which one spin orientation of electrons from the ferromagnet penetrates more easily into a chiral molecule than does the other orientation. The large potential changes (>kT at room temperature) manifested here imply that this phenomenon is important for spin transport in chiral spintronic devices and for magneto-electrochemistry of chiral molecules.

Original languageAmerican English
Pages (from-to)1550-1557
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume11
Issue number4
DOIs
StatePublished - 20 Feb 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Fingerprint

Dive into the research topics of 'Effect of Chiral Molecules on the Electron's Spin Wavefunction at Interfaces'. Together they form a unique fingerprint.

Cite this