Many-body effects in the binding energies of image states at surfaces |
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| Affiliation: | 1. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800, USA;2. C. N. Yang Institute for Theoretical Physics, State University of New York at Stony Brook, Stony Brook, NY 11794-3840, USA;3. Institute for Advanced Computational Science, State University of New York at Stony Brook, Stony Brook, NY 11794-5250, USA;1. RAS P.N. Lebedev Physical Institute, Moscow, Russia;2. NR Nuclear University MEPhI, Moscow, Russia;3. INFN Laboratori Nazionali di Frascati, Frascati, Italy |
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| Abstract: | A study of the influence of many-body effects on binding energies and effective masses of image potential induced surface states is presented. The binding energies calculated using experimentally measured ε(ω) response functions show a dependence on the electron density different from that obtained using a plasmon model, and are in agreement with recent experimental data of diesen et al. [Phys. Rev. B33 (1986) 5241]. The effects of plasmon dispersion and single particle excitations on binding energies are evaluated with a simple model, and it is shown that they result in a strong cancellation in the range of rs values where most experimental data have been obtained (rs ≈ 3), if realistic values of the surface plasmon dispersion relation are used. Corrections to the effective masses due to many-body effects are shown to be of the order of 1%. |
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