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

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.

4 REVTeX pages, 4 Postscript figures

References in corpus (1)

• Novel approach to description of spin liquid phases in low-dimensional quantum antiferromagnets

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