Time-of-flight pictures like this reveal ground-state properties of frustrated antiferromagnets

Frustrated spin systems

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Ultracold gases in optical lattices are versatile tools to simulate strongly-correlated systems. Among these, particularly important are frustrated antiferromagnets, because of their relevance to high-temperature superconductivity and the fundamental understanding of matter. We study the properties of such models and propose how to realize them experimentally. The low-temperature physics of these systems shows a very rich interplay between semiclassically-ordered and exotic disordered phases, such as valence-bond solids or spin liquids, which may harbor fractional excitations with possible applications in quantum information processing.

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