Ultrafast Mott transition driven by nonlinear electron-phonon interaction

Nonlinear phononics holds the promise for controlling properties of quantum materials on ultrashort timescale. Using nonequilibrium dynamical mean-field theory, we solve a model description organic solids, where correlated electrons couple nonlinearly to phonon mode. Unlike previous works, exactly diagonalize local mode within noncrossing approximation include full phononic fluctuations. By exciting in broad range frequencies near resonance with an pulse, show it is possible induce Mott insulator-to-metal phase transition. Conventional semiclassical and calculations, electron-phonon interaction decouples, underestimate onset quasiparticle peak. This fact, together nonthermal character photoinduced metal, suggests leading role fluctuations dynamic nature state vibrationally induced coherence.