Pseudogap phase of high-Tc compounds described within the LDA+DMFT+Sigma approach

TL;DR

This paper uses the LDA+DMFT+Sigma approach to model the pseudogap phase in high-Tc superconductors, revealing material-specific differences in Fermi surface features and aligning well with ARPES experimental data.

Contribution

It introduces a combined LDA+DMFT+Sigma method to accurately describe pseudogap phenomena and Fermi surface variations in different high-Tc compounds.

Findings

Fermi arcs observed in hole-doped compounds without hot-spots.

Clear hot-spot features in electron-doped compounds.

Good agreement with ARPES data for spectral functions.

Abstract

LDA+DMFT+Sigma_k approach was applied to describe pseudogap phase of several prototype high-Tc compounds e.g. hole doped Bi2212 and LSCO systems and electron doped NCCO and PCCO, demonstrating qualitative difference of the Fermi surfaces (FS) for these systems. Namely for Bi2212 and LSCO the so called "hot-spots" (intersection of a bare FS and AFM Brillouin zone (BZ) boundary), where scattering on pseudogap fluctuations is most intensive were not observed. Instead here we have Fermi arcs with smeared FS close to the BZ boundary. However for NCCO and PCCO "hot-spots" are clearly visible. This qualitative difference is shown to have material specific origin. Good agreement with known ARPES data was demon strated not only for FS maps but also for spectral function maps (quasiparticle bands in cluding lifetime and interaction broadening).