920860.fig.006a
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920860.fig.006b
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920860.fig.006c
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Figure 6: Comparison between the DMFT momentum-integrated spectral function ( being the local Green's function) for the Hubbard-Holstein model (dotted line) and the effective purely electronic Hubbard model with (solid line). The low-energy part of the spectra is perfectly reproduced by the effective model, while the high-energy features present phononic signatures that cannot be plugged in an effective static interaction (after Sangiovanni et al. [45]).