Growth Dynamics and Electron Reflectivity in Ultrathin Films of Chiral Heptahelicene on Metal (100) Surfaces Studied by Spin-Polarized Low Energy Electron Microscopy

Baljozović, Miloš; Fernandes Cauduro, André L.; Seibel, Johannes; Mairena, Anaïs; Grass, Stéphane; Lacour, Jérôme; Schmid, Andreas K.; Ernst, Karl-Heinz

doi:10.1002/pssb.202100263

Title: Growth Dynamics and Electron Reflectivity in Ultrathin Films of Chiral Heptahelicene on Metal (100) Surfaces Studied by Spin-Polarized Low Energy Electron Microscopy

Journal Article · 02 October 2021 · Physica Status Solidi B. Basic Solid State Physics

DOI: https://doi.org/10.1002/pssb.202100263 · OSTI ID:1899335

Baljozović, Miloš ^[1]; Fernandes Cauduro, André L. ^[2]; Seibel, Johannes ^[1]; Mairena, Anaïs ^[1]; Grass, Stéphane ^[3]; Lacour, Jérôme ^[3]; Schmid, Andreas K. ^[2];

^[1]

Swiss Federal Laboratories for Materials Science and Technology, Dübendorf (Switzerland)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy
University of Geneva (Switzerland)

Interaction of electrons with chiral matter gives rise to interesting phenomena such as the chirality-induced spin selectivity. The interdependence of reflectivity of spin-polarized low energy electrons and the absolute handedness of chiral molecules is investigated. First, the growth of homochiral films of helical aromatic hydrocarbons, so-called helicenes, on a Cu(100) surface is studied by means of low energy electron microscopy and scanning tunneling microscopy in ultrahigh vacuum. As soon as the coverage exceeds one monolayer, double-layer nucleation and growth is favored such that depletion in the first layer occurs. Spatially resolved work function measurements show that second-layer patches have a lower work function than first-layer areas. Reflectivity spectra of spin-polarized electrons do not show any asymmetry between homochiral films of the enantiomers. Laterally resolved work function measurements do not confirm work function differences such as those reported earlier for photoelectron studies of chiral peptide films on ferromagnetic substrates.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation; University of Geneva

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1899335

Journal Information:: Physica Status Solidi B. Basic Solid State Physics, Journal Name: Physica Status Solidi B. Basic Solid State Physics Journal Issue: 12 Vol. 258; ISSN 0370-1972

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Growth Dynamics and Electron Reflectivity in Ultrathin Films of Chiral Heptahelicene on Metal (100) Surfaces Studied by Spin-Polarized Low Energy Electron Microscopy

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