Abstract

An interesting type of spin chain has appeared in the context of the planar AdS/CFTcorrespondence: it is based on an integrable nearest-neighbor spin chain, and it isperturbatively deformed by long-range interactions which apparently preserve theintegrable structure. Similar models can be constructed by demanding the existence ofmerely one conserved local charge. Although the latter is not a sufficient integrabilitycondition in general, the models often display convincing signs of full integrability.Here we consider a class of long-range spin chains with spins transforming in thefundamental representation of . For the most general such model with one conserved local charge we construct aconserved Yangian generator and show that it obeys the Serre relations. We thus provide aformal proof of integrability for this class of models.

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