Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 20, Pages 4373-4376Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.4373
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We present a new linked cluster expansion for calculating properties of multiparticle excitation spectra to high orders. We use it to obtain the two-particle spectra for systems of coupled spin-half dimers. We find that even for weakly coupled dimers the spectrum is very rich, consisting of many bound states. The number of bound states depends on both geometry of coupling and frustration. Many of the bound states can only be seen by going to sufficiently high orders in the perturbation theory, showing the extended character of the pair attraction.
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