Figure 4

Relationship between relaxation times and spin correlations.

(a) Decay-time of high-energy PES at U = 12 as a function of temperature at two fluences; the relaxation time is obtained from the exponential fits shown in Fig. 3d. Inset: Dependence of τ for temperature T = 0.1 on the amplitude E₀. (b) Time-dependence of S_NN after excitation with low fluence (E₀ = 6, N_ex ≈ 0.9% solid lines) and high fluence (E₀ = 14, N_ex ≈ 4.5%, dashed line). (c) Relaxation rate 1/τ in the low fluence regime (E₀ = 3, N_ex ≈ 0.2%) computed for various temperatures and plotted as a function of the equilibrium value . For each value of U, relaxation times have beed obtained from the time-dependent weight around the upper band edge (U = 10: ω = 8.5, pump frequency Ω = 13; U = 12: ω = 9.5, Ω = 16; U = 15: ω = 10.75, Ω = 18).