Valence Band Circular Dichroism in non-magnetic Ag/Ru(0001) at normal emission

For the non-magnetic system of Ag films on Ru(0001), we have measured the circular dichroism of photoelectrons emitted along the surface normal, the geometry typically used in photoemission electron microscopy (PEEM). Photoemission spectra were acquired from micrometer-sized regions having uniformly...

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Bibliographic Details
Published in:arXiv.org 2013-01
Main Authors: Mascaraque, Arantzazu, Menteş, T Onur, McCarty, Kevin F, Marco, Jose F, Schmid, Andreas K, Locatelli, Andrea, de la Figuera, Juan
Format: Article
Language:English
Subjects:
Dichroism
Electrons
Film thickness
Photoelectric emission
Photoelectrons
Ruthenium
Thick films
Valence band
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Summary:For the non-magnetic system of Ag films on Ru(0001), we have measured the circular dichroism of photoelectrons emitted along the surface normal, the geometry typically used in photoemission electron microscopy (PEEM). Photoemission spectra were acquired from micrometer-sized regions having uniformly thick Ag films on a single, atomically flat Ru terrace. For a single Ag layer, we find a circular dichroism that exceeds 6% at the d-derived band region around 4.5 eV binding energy. The dichroism decreases as the Ag film thickness increases to three atomic layers. We discuss the origin of the circular dichroism in terms of the symmetry lowering that can occur even in normal emission.
ISSN:2331-8422
DOI:10.48550/arxiv.1301.4354