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$\mathrm{MoTe_2}$ has recently been shown to realize in its low-temperaturephase the type-II Weyl semimetal (WSM). We investigated by time- and angle-resolved photoelectron spectroscopy (tr-ARPES) the possible influence of theWeyl points in the electron dynamics above the Fermi level $\mathrm{E_F}$, bycomparing the ultrafast response of $\mathrm{MoTe_2}$ in the trivial andtopological phases. In the low-temperature WSM phase, we report an enhancedrelaxation rate of electrons optically excited to the conduction band, which weinterpret as a fingerprint of the local gap closure when Weyl points form. Bycontrast, we find that the electron dynamics of the related compound$\mathrm{WTe_2}$ is slower and temperature-independent, consistent with atopologically trivial nature of this material. Our results shows that tr-ARPESis sensitive to the small modifications of the unoccupied band structureaccompanying the structural and topological phase transition of$\mathrm{MoTe_2}$.

Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $\mathbf{MoTe_2}$ measured by time-and angle-resolved photoelectron spectroscopy