Localization-delocalization dichotomy: Inherent spectral properties of the cuprates

TL;DR

This paper investigates the spectral properties of high-temperature cuprates, revealing a coexistence of localized pseudogap features and delocalized propagating modes influenced by anisotropic electron dispersion.

Contribution

It introduces a model explaining how resonant scattering on deformable molecular units causes both localization and delocalization in cuprates' spectra, highlighting anisotropic effects.

Findings

Coexistence of pseudogap and Bogoliubov modes in spectra

Anisotropic impact on different Brillouin zone regions

Distinct effects along the Fermi arc

Abstract

We consider hole pairing in the pseudopgap phase of High T_c cuprates, as arising from resonant scattering on dynamically deformable molecular units. As a result, localized and delocalized features coexist in the one-particle spectra: the pseudogap and propagating diffusive Bogoliubov modes. Due to the anisotropy of the electron dispersion and pairing interaction, these two manifestations have different impact in the different regions of the Brillouin zone. We illustrate that for k-vectors crossing the arc, determined by the chemical potential, joining the anti-nodal and the nodal point.