We investigate the terahertz and optical driven ultrafast dynamics in platinum and gold thin films by pump-probe reflectivity measurements with an optical probe. Platinum shows similar reflectivity change for both pump excitations, whereas gold shows a negligible reflectivity change for the terahertz pump. By employing a two-temperature model, we can explain the dynamics in platinum and determine electron-phonon coupling constant for the two pump excitations. We estimate a 20% larger electron-phonon coupling for terahertz-driven dynamics compared to the optical one, which we attribute to a concomitant nonthermal regime for both phonons and electrons. In the case of gold, we explain the negligible response as a terahertz-driven field emission of electrons via Fowler-Nordheim tunneling.
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