Magnon mode truncation in a rung-dimerized asymmetric spin ladder

Abstract

An exactly solvable effective model is suggested for an asymmetric spin ladder with dimerized rungs. Magnon mode truncation originated from magnon decay (recently observed in the 1D compound ${\mathrm{IPA}-\mathrm{CuCl}}_3$) is naturally described within this model. Using Bethe Ansatze we described a one-magnon sector and obtained relations between interaction constants of the model and experimentally observable quantities such as the gap and truncation energies, spin velocity and the truncation wave vector. It is also shown that structure factor turns to zero at the truncation point.

11 pages

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Cited by in corpus (5)

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• Microscopic model for Bose-Einstein condensation and quasiparticle decay
• Three-magnon problem for exactly rung-dimerized spin ladders: from general outlook to Bethe Ansatze