Soliton Confinement and the Excitation Spectrum of Spin-Peierls Antiferromagnets

TL;DR

This paper investigates the excitation spectrum of spin-Peierls antiferromagnets, revealing a ladder of soliton-anti-soliton bound states and analyzing the transition to soliton deconfinement in a non-dimerized phase.

Contribution

It introduces a mean field approach to inter-chain elastic couplings and accounts for phonon dynamics, providing new insights into soliton confinement and excitation spectra.

Findings

No soliton continuum until deconfinement transition

Presence of bound states of soliton-anti-soliton pairs

Transition into a non-dimerized phase

Abstract

The excitation spectrum of spin-Peierls antiferromagnets is discussed taking into acount phonon dynamics but treating inter-chain elastic couplings in mean field theory. This gives a ladder of soliton -anti-soliton boundstates, with no soliton continuum, until soliton deconfinement takes place at a transition into a non-dimerized phase.