Electronic structure of Pr_{2-x}Ce_xCuO_4 studied via ARPES and LDA+DMFT+\Sigma_k

TL;DR

This study combines ARPES experiments and advanced theoretical modeling (LDA+DMFT+) to analyze the electronic structure and pseudogap phenomena in electron-doped Pr_{2-x}Ce_xCuO_4, revealing key features like Fermi surface reconstruction.

Contribution

It introduces a combined experimental and theoretical approach using LDA+DMFT+ to accurately describe the pseudogap state in electron-doped cuprates.

Findings

Observation of pseudogap with AFM-like features in spectra

Identification of Fermi surface folding, hot spots, and Fermi arcs

Good agreement between experimental data and theoretical models

Abstract

The electron-doped Pr(2-x)Ce(x)CuO(4) (PCCO) compound in the pseudogap regime (x~0.15) was investigated using angle-resolved photoemission spectroscopy (ARPES) 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 (NRG) 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 (FS) were obtained and compared demonstrating 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 presence of the "hot spots" and "Fermi arcs" were observed.