Ultrathin Fe film on Cu(0 0 1): Exchange splitting of image states from first principles |
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Authors: | S. Achilli S. Caravati |
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Affiliation: | a Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, I-20125 Milano, Italy b CNISM, UdR Milano-Bicocca, via Cozzi 53, I-20125 Milano, Italy |
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Abstract: | The theoretical investigation of the image states in front of an ultrathin iron film grown on copper has been performed by means of the embedding method and a recently developed procedure for the inclusion of the image potential tail in a first principle calculation. From the electronic response to an applied electric field, the image plane position has been evaluated. This also allows one to obtain useful information about the spin dependent screening properties of the system. Exchange splitting, effective mass, and lifetime of such surface states result in good agreement with recently performed two-photon photoemission experiments [see A.B. Schmidt, M. Pickel, M. Wiemhöfer, M. Donath, M. Weinelt, Phys. Rev. Lett. 95 (2005) 107402]. |
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Keywords: | Photoemission Excited states Metallic surfaces Density functional calculations Green&rsquo s function methods |
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