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O: Oberflächenphysik

O 41: Elektronische Struktur III

O 41.7: Vortrag

Dienstag, 8. März 2005, 12:15–12:30, TU EB107

Influence of electron-phonon-coupling on the spectral function of nitrogen induced adsorbate states on Cu(100) — •Christian Bumiller, Thordis Michalke, Christian Kant, and René Matzdorf — Institut für Physik, Universität Kassel

We investigated the self organized surface of the adsorbate system nitrogen on copper (Cu(100)c(2×2)N) by means of angle resolved photoelectron spectroscopy (ARPES). Temperature dependent photoelectron spectra reveal a very strong electron-phonon-coupling of the nitrogen induced states on Cu(100). The strong coupling is very interesting for electronic states close to the Fermi level. One adsorbate state shows exceptional behaviour when approaching the Fermi energy. The spectral function changes drastically with the energy position. Here the real part of the self energy for the electron-phonon-coupling is visible. We show the influence of the self energy at different temperatures and binding energies. The characteristic features of the spectra are explained with the Eliashberg theory using the Einstein and Debye models for the phonon density of states.