Spin excitations in fluctuating stripe phases of doped cuprate superconductors

TL;DR

This paper investigates spin excitations in doped cuprate superconductors with fluctuating stripe charge order, using a combined Monte Carlo and exact diagonalization approach to unify static and dynamic stripe phase spin dynamics.

Contribution

It introduces a phenomenological lattice model that captures the spin susceptibility in fluctuating stripe phases, bridging static and dynamic charge order effects.

Findings

Supports a universal spin excitation spectrum in doped cuprates

Unifies spin dynamics of static and fluctuating stripe phases

Uses combined Monte Carlo and exact diagonalization methods

Abstract

Using a phenomenological lattice model of coupled spin and charge modes, we determine the spin susceptibility in the presence of fluctuating stripe charge order. We assume the charge fluctuations to be slow compared to those of the spins, and combine Monte Carlo simulations for the charge order parameter with exact diagonalization of the spin sector. Our calculations unify the spin dynamics of both static and fluctuating stripe phases and support the notion of a universal spin excitation spectrum in doped cuprate superconductors.