Stripes in cuprate superconductors: Excitations and dynamic dichotomy

TL;DR

This paper reviews experimental and theoretical insights into stripe phenomena in cuprate superconductors, highlighting their complex excitations, coexistence with Fermi liquid behavior, and the use of advanced models to understand their properties.

Contribution

It demonstrates that realistic Hubbard models combined with the time-dependent Gutzwiller approximation accurately reproduce experimental observations of stripe excitations and dynamics.

Findings

Agreement of computed collective modes with experiments

Coexistence of stripe order with Fermi liquid quasiparticles

A phenomenological model explains the dynamic dichotomy

Abstract

We present a short account of the present experimental situation of stripes in cuprates followed by a review of our present understanding of their ground state and excited state properties. Collective modes, the dynamical structure factor, and the optical conductivity of stripes are computed using the time-dependent Gutzwiller approximation applied to realistic one band and three band Hubbard models, and are found to be in excellent agreement with experiment. On the other hand, experiments like angle-resolved photoemission and scanning tunneling microscopy show the coexistence of stripes at high energies with Fermi liquid quasiparticles at low energies. We show that a phenomenological model going beyond mean-field can reconcile this dynamic dichotomy.