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We use molecular dynamics simulations with machine-learned atomistic forcefields to simulate photoexcitation of BaTiO3 by a femtosecond laser pulse whosephoton energy exceeds the optical gap. We demonstrate selective displaciveexcitation of coherent zone-center ferroelectric mode phonons and of thestrongly anharmonic central mode. We show that the direction of P can either bereversed by a pulse in hundreds of femtoseconds or, on a longer time scale andwhen combined with a weak field, switched to any one of its symmetry-equivalentdirections.

Ultrafast polarization switching in BaTiO$_3$ by photoactivation of its ferroelectric and central modes