Momentum-dependent pseudogaps in the half-filled two-dimensional Hubbard model
Momentum-dependent pseudogaps in the half-filled two-dimensional Hubbard model
We compute unbiased spectral functions of the two-dimensional Hubbard model by extrapolating Green functions, obtained from determinantal quantum Monte Carlo simulations, to the thermodynamic and continuous time limits. Our results clearly resolve the pseudogap at weak to intermediate coupling, originating from a momentum selective opening of the charge gap. A …