Calculation of the Fermi surface with complex topology from norm-conserving cluster perturbation theory for doping dependent electronic structure of the Hubbard model

摘要

The results of recently developed norm-conserving cluster perturbation theory for doping dependent electronic structure of the Hubbard model are reported. We have found that the momentum distribution of the spectral weight strongly depends on the broadening value δ. At δ = 0.1t, we reproduce the angle-resolved photoemission spectroscopy data, while at δ = 0.01t we obtain two quantum phase transitions.