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Gap state imaging and spin-orbit effects in resonant photoelectron diffraction

TitleGap state imaging and spin-orbit effects in resonant photoelectron diffraction
Publication TypeJournal Article
Year of Publication2016
AuthorsKruger, P., & Da Pieve F.
Keywordsphotoelectron diffraction; resonant photoemission; titanium oxide; transition metals
Abstract

In core-level photoelectron diffraction, the surface atomic structure is imaged through a local source wave. In valence photoemission, the source wave gets effectively localized at a core-valence resonance, and local information on valence states can be obtained. Through photoelectron diffraction at the Ti 2p-3d resonance, we have determined the charge distribution of the gap state at n-doped TiO2 surfaces. Second, the origin of spin polarization in resonant photoemission from non-ferromagnetic surfaces is critically reviewed. We have developed a multiple scattering computational method for resonant photoemission and have applied it to Cr(110) and Fe(100). For circular polarized light, we find that the resonant photocurrent is strongly spin polarized in antiferromagnets and disordered ferromagnets, in agreement with experiment. Contrary to previous interpretations, we show that this spin polarization is essentially unrelated to local magnetic moments, but because of an angular momentum transfer from the photon to the photoelectron via core spin-orbit coupling and exchange autoionization decay. Copyright (c) 2016 John Wiley & Sons, Ltd.

JournalSURFACE AND INTERFACE ANALYSIS
Volume48
Pagination1169-1174
DOI10.1002/sia.6182
Date PublishedNOV
Type of ArticleArticle; Proceedings Paper
Citation Key ISI:000386770000019