Prediction of strong dichroism induced by x rays carrying orbital momentum

We predict the presence of strong dichroic effects induced by x-ray beams carrying orbital angular momentum (OAM). Taking the difference between spectra obtained with positive and negative OAM states allows the separation of quadrupolar from dipolar transitions at, e.g., the transition-metal K edges...

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Bibliographic Details
Published in:Physical review letters 2007-04, Vol.98 (15), p.157401-157401, Article 157401
Main Authors: van Veenendaal, Michel, McNulty, Ian
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
DICHROISM
FORECASTING
NUCLEAR PHYSICS AND RADIATION PHYSICS
X RADIATION
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Summary:We predict the presence of strong dichroic effects induced by x-ray beams carrying orbital angular momentum (OAM). Taking the difference between spectra obtained with positive and negative OAM states allows the separation of quadrupolar from dipolar transitions at, e.g., the transition-metal K edges, enabling the study of the unoccupied states in the absence of strong core-hole effects. We study the dependence of OAM-induced x-ray dichroism on different polarization vectors and derive sum rules relating the integrated intensity to ground-state hole densities. Calculations of spectral line shapes for cuprates, manganites, and ruthenates confirm the strong OAM-induced dichroism and indicate the potential of this new spectroscopy in the fields of orbital physics and magnetism.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.98.157401