Bound states of magnons in the S=1/2 quantum spin ladder

Preprint

14 March 1998

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9803180

Abstract

We study the excitation spectrum of the two-leg antiferromagnetic S=1/2 Heisenberg ladder. Our approach is based on the description of the excitations as triplets above a strong-coupling singlet ground state. The quasiparticle spectrum is calculated by treating the excitations as a dilute Bose gas with infinite on-site repulsion. We find singlet (S=0) and triplet (S=1) two-particle bound states of the elementary triplets. We argue that bound states generally exist in any dimerized quantum spin model.

Keywords

EXCITATION SPECTRUM
ANTIFERROMAGNETIC
BOUND STATES
QUANTUM SPIN
SPIN LADDER
DIMERIZED
SPECTRUM
MAGNONS
STATES

All Related Versions

Version 1, 1998-03-14, ArXiv
Published version: Physical Review Letters, 81 (9), 1941.

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