30 fs infrared spectroscopy of photo-induced phase transition in 14 filling organic salt

Abstract Primary dynamics of photo-induced melting of charge order (CO) and metallic domain formation in [ bis (ethlylenedithio)] tetrathiafulvalene (BEDT-TTF) salts α-(BEDT-TTF) 2 I 3 were studied using an infrared (1.4 μm) pump–probe spectroscopy with a time resolution of 30 fs. Faster ( τ cor ) of the photo-induced insulator to metal transition was also measured by double-pulse excitation. The observed τ cor (0.4 ps) is shorter than the stabilization time of the semi-macroscopic metallic domain.