Abstract
We report the time-resolved excited state ultrafast dynamics of single unit cell (1UC) thick FeSe films on SrTiO_{3} (STO), with FeTe capping layers. By measuring the photoexcited quasiparticles' density and lifetime, we unambiguously identify a superconducting (SC) phase transition, with a transition temperature T_{c} of 68 (-5/+2) K and a SC gap of Δ(0)=20.2±1.5 meV. The obtained electron-phonon coupling strength λ is as large as 0.48, demonstrating the likely crucial role of electron-phonon coupling in the high temperature superconductivity of the 1UC FeSe on STO systems. We further find a 0.05THz coherent acoustic phonon branch in the capping layer, which provides an additional decay channel to the gluing bosons.
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