Evidence for bootstrap percolation dynamics in a photo-induced phase transition
arXiv:2305.05220 · doi:10.1103/PhysRevLett.130.186902
Abstract
Upon intense femtosecond photo-excitation, a many-body system can undergo a phase transition through a non-equilibrium route, but understanding these pathways remains an outstanding challenge. Here, we use time-resolved second harmonic generation to investigate a photo-induced phase transition in CaRuO and show that mesoscale inhomogeneity profoundly influences the transition dynamics. We observe a marked slowing down of the characteristic time, , that quantifies the transition between two structures. evolves non-monotonically as a function of photo-excitation fluence, rising from below 200~fs to 1.4~ps, then falling again to below 200~fs. To account for the observed behavior, we perform a bootstrap percolation simulation that demonstrates how local structural interactions govern the transition kinetics. Our work highlights the importance of percolating mesoscale inhomogeneity in the dynamics of photo-induced phase transitions and provides a model that may be useful for understanding such transitions more broadly.
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