The electron–phonon self-energy of metallic systems determined by angular resolved high-resolution photoemission

• Published in: Physica. B, Condensed matter Condensed matter, 2004-09, Vol.351 (3), p.229-234
• Main Authors: Reinert, F., Eltner, B., Nicolay, G., Forster, F., Schmidt, S., Hüfner, S.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electron–phonon coupling; Exact sciences and technology; Photoemission spectroscopy; Physics; Strongly correlated systems; heavy fermions; Superconductivity; Surface and interface electron states; Surface states; Surface states, band structure, electron density of states
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2004.06.013

By use of modern high-resolution photoemission spectrometers, one is able to determine experimentally both the real and the imaginary part of the electron–phonon self-energy Σ el–ph of metallic systems. Here, we present angular resolved photoemission data (ARUPS) on the Shockley-type surface state on Cu(1 1 1) , a model system for the investigation of many-body effects in solids. By analyzing the line width and the peak position of the surface state, one can extract its self-energy which can be compared to a simple theoretical description using the Debye model. We discuss to what extent these results can be transferred to the electronic structure of a three-dimensional solid with strong electron–phonon effects, e.g. Pb(1 1 0), which is a classical example for a superconductor in the strong-coupling regime.