Electronic structure of Pr2-xCexCuO4 studied via ARPES and LDA plus DMFT+Σk

The electron-doped Pr2-xCexCuO4 (PCCO) compound in the pseudogap regime (x approximate to 0.15) was investigated using the angle-resolved photoemission spectroscopy and the generalized dynamical mean-field theory (DMFT) with the k-dependent self-energy (LDA+DMFT+Sigma(k)). Model parameters (hopping integral values and local Coulomb interaction strength) for the effective one-band Hubbard model were calculated by the local-density approximation (LDA) with numerical renormalization-group method employed as an impurity solver in DMFT computations. An external k-dependent self-energy Sigma(k) was used to describe interaction of correlated conducting electrons with short-range antiferromagnetic (AFM) pseudogap fluctuations. Both experimental and theoretical spectral functions and Fermi surfaces were obtained and compared demonstrating a good semiquantitative agreement. For both experiment and theory normal-state spectra of nearly optimally doped PCCO show clear evidence for a pseudogap state with AFM-like nature. Namely, folding of quasiparticle bands as well as the presence of the hot spots and Fermi arcs was observed.