Momentum and thickness-dependent evolution of quantum well states in the Cu/Co/Cu(001) system

ORAL

Abstract

Experimental advances in sample fabrication allow the observation of individual quantum well (QW) states from discrete atomic layer thicknesses. We present comprehensive angle-resolved photoemission measurements of the Fermi surface and underlying band structure of QW states in Cu/Co/Cu(001). Compared to bands from normal emission, we find a complicated evolution of QW states as a function of the thickness of both the copper overlayer and the cobalt barrier layer, as well as of the emission angle. This reveals a very high sensitivity of ``off-normal'' QW states to film thickness. Self-consistent calculations reveal a significant interaction between the QW states in the Cu overlayer and the Co barrier states, which leads to the observed complex behavior in particular ranges of energy and emission angle.

*Supported by DOE and NSF

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Authors

  • M.A. Van Hove

    • MSD and ALS, Lawrence Berkeley National Laboratory, Berkeley, CA 94720; Dept. of Physics, University of California, Davis, Davis, CA 95616
    • LBNL, Berkeley, and UC-Davis

  • J.M. An

  • A. Canning

  • L.-W. Wang

  • E. Rotenberg

    • LBNL, Berkeley

  • Y.Z. Wu

  • Z.Q. Qiu

    • LBNL, Berkeley, and UC-Berkeley