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Nonlinear processes involving frequency-mixing of light fields set the basisfor ultrafast coherent spectroscopy of collective modes in solids. In certainsemimetals and semiconductors, generation of coherent phonon modes can occur bya displacive force on the lattice at the difference-frequency mixing of a laserpulse excitation on the electronic system. Here, as a low-frequency counterpartof this process, we demonstrate that coherent phonon excitations can be inducedby the sum-frequency components of an intense terahertz light field, coupled tointraband electronic transitions. This nonlinear process leads tocharge-coupled coherent dynamics of Raman-active phonon modes in the stronglycorrelated metal V$_2$O$_3$. Our results show a new up-conversion pathway forthe optical control of Raman-active modes in solids mediated byterahertz-driven electronic excitation.

Terahertz displacive excitation of a coherent Raman-active phonon in V$_2$O$_3$