920860.fig.0011
Figure 11: Quasiparticle renormalization as a function of 𝜆 for different values of 𝑈 and 𝜔 0 = 0 . 0 1 2 5 𝑊 . The value of 𝜆 at which polaron formation occurs is only moderately increased by correlations with respect to the noninteracting case (after Sangiovanni et al. [92]).