Prediction of Strong Dichroism Induced by X Rays Carrying Orbital Momentum

Michel van Veenendaal and Ian McNulty
Phys. Rev. Lett. 98, 157401 – Published 9 April 2007

Abstract

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.

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  • Received 3 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.157401

©2007 American Physical Society

Authors & Affiliations

Michel van Veenendaal1,2 and Ian McNulty2

  • 1Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA
  • 2Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

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Issue

Vol. 98, Iss. 15 — 13 April 2007

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