Seminars Archive
Electro-Lattic Interaction on Ga(001)
Institute for Storage Ring Facilities, University of Aarhus
Abstract
We have investigated the (001) surface of alfa-Ga by angle-resolved photoemission and low energy electron diffraction. We find a surface state around the $ar{C}$ point of the surface Brillouin zone as predicted by first-principles calculations.
The temperature dependence of the surface state linewidth suggests that the electron-phonon coupling at this surface is very strong with an electron-phonon mass enhancement parameter of $lambda $ = 1.4$pm$0.10. Our spectra show high background intensity in a projected bulk band gap which can not be accounted for by defect scattering and is therefore interpreted as indicating a non-quasiparticle behaviour. Upon cooling the sample below 230 K we observe a phase transition accompanied by spectral changes near the Fermi level.