Abstract
The excited electron dynamics in ytterbium is investigated by means of the time-resolved two-photon photoemission spectroscopy and ab initio $\mathrm{GW}+\mathrm{T}$-matrix approach. We show that the standard GW approach with core $4f$ orbitals fails to describe the experimental energy trend of the lifetimes. However, a fine agreement with the experimental data is achieved within the $\mathrm{GW}+\mathrm{T}$-matrix approach when $4f$ orbitals are included in a valence basis set. In contrast to previous scanning tunneling spectroscopy data, we show that at small excitation energy, the energy dependence of lifetimes strongly deviates from that for the free-electron gas. We also argue that the e-ph coupling in Yb should be weak.
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