Dynamical central peak and spinon deconfinement in frustrated spin chains

TL;DR

This paper investigates the dynamical spin structure factor in frustrated spin chains, revealing a temperature-dependent central peak due to deconfined spinons, with implications for experimental observations in 1D materials.

Contribution

It demonstrates the emergence of a sharp central peak at finite temperatures caused by spinon deconfinement in frustrated spin chains, using a variational approach.

Findings

Presence of a sharp central peak at finite temperatures

Central peak attributed to deconfined spinons

Relevance for experiments on 1D frustrated spin chain materials

Abstract

Studying the dynamical spin structure factor in frustrated spin chains with spontaneously dimerized ground state we show that besides the gapped spin-wave excitations there appears at finite temperatures also a sharp central peak. The latter can be attributed to deconfined spinons, accounted well within the variational approach. The central peak remains well pronounced within the local spin dynamics and may be relevant for experiments on materials with 1D frustrated spin chains.