Dynamics of metallic stripes in cuprates

TL;DR

This paper investigates the dynamics of metallic stripes in cuprates using a three-band Hubbard model and time-dependent Gutzwiller approximation, revealing spectral weight transfer and collective mode softening with doping.

Contribution

It introduces a detailed theoretical analysis of stripe dynamics in cuprates, connecting spectral features with doping-dependent stripe configurations.

Findings

Spectral weight shifts from charge transfer band to incoherent and Drude bands with doping.

Identification of a low energy collective mode that softens and merges with the Drude peak at optimal doping.

Good agreement of theoretical results with experimental observations.

Abstract

We study the dynamics of metallic vertical stripes in cuprates within the three-band Hubbard model based on a recently developed time dependent Gutzwiller approximation. As doping increases the optical conductivity shows transfer of spectral weight from the charge transfer band towards i) an incoherent band centered at 1.3eV, {ii} a Drude peak, mainly due to motion along the stripe, {iii} a low energy collective mode which softens with doping and merges with ii} at optimum doping in good agreement with experiment. The softening is related to the quasidegeneracy between Cu centered and O centered mean-field stripe solutions close to optimal doping.