Abstract
The dynamic nonlinear susceptibility χ (3)(ω) was investigated in α-[bisethylenedithiotetrathiofulvalene]triiodide, α-[BEDT-TTF] 2I 3, by four-wave mixing with femtosecond time resolution. α-[BEDT-TTF] 2I 3 undergoes a metal—insulator phase transition at 135 K. This organic conductor has a large χ (3) (ω) with four components: one is vibrational (Raman) and three others are electronic. The temperature dependence of χ (3) (ω) was studied between 15 and 295 K. The dependence of the decay times with temperature can be associated with the dynamics of the metal—insulator phase transition in this system.
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