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The coupling of the electron system to lattice vibrations and theirtime-dependent control and detection provides unique insight into thenon-equilibrium physics of semiconductors. Here, we investigate the ultrafasttransient response of semiconducting monolayer 2$H$-MoTe$_2$ encapsulated with$h$BN using broadband optical pump-probe microscopy. The sub-40-fs pump pulsetriggers extremely intense and long-lived coherent oscillations in the spectralregion of the A' and B' exciton resonances, up to $\sim$20% of the maximumtransient signal, due to the displacive excitation of the out-of-plane $A_{1g}$phonon. Ab-initio calculations reveal a dramatic rearrangement of the opticalabsorption of monolayer MoTe$_2$ induced by an out-of-plane stretching andcompression of the crystal lattice, consistent with an $A_{1g}$-typeoscillation. Our results highlight the extreme sensitivity of the opticalproperties of monolayer TMDs to small structural modifications and theirmanipulation with light.

Strong Coupling of Coherent Phonons to Excitons in Semiconducting Monolayer MoTe$_2$