Nonlinear polaron dynamics in colossal magnetoresistance manganites driven by intense THz pulses

Using intense, few-cycle THz pulses we investigate the strong-field interaction with polarons in La
0.7
Ca
0.3
MnO
3
. By probing the optical reflectivity, we observe a THz-induced detrapping of electrons from polarons, followed by thermalization of phonons with spins.