Abstract
We report an ab initio study of the electron–phonon (e–ph) interaction and its contributionto the lifetime broadening of excited hole (electron) surface states on Al(001). Thecalculations based on density-functional theory were carried out using a linear responseapproach in the plane-wave pseudopotential representation. The obtained results show thatboth the electron–phonon coupling and the linewidth experience a weak variation with theenergy and momentum position of a hole (electron) surface state in the energy band. Ananalysis of different contributions to the e–ph coupling reveals that bulk phonon modesturn out to be more involved in the scattering processes of excited electrons and holes thansurface phonon modes. It is also shown that the role of the e–ph coupling in the broadeningof the Rayleigh surface phonon mode is insignificant compared to anharmoniceffects.
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