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Coupled-dimer magnets have become model systems in the study of quantum phase transitions. After a brief introduction to quantum criticality in magnets, the talk will discuss various theoretical approaches to describe coupled-dimer magnets, using both field-theoretic and microscopic techniques, and link the results to experimental observations. In particular, a novel expansion in 1/d will be presented where d is spatial dimensionality. In addition, interesting phenomena arising from quenched disorder in coupled-dimer magnets will be highlighted, both for dilute and dense concentration of defects.

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Matthias Vojta, TU Dresden
Seminar Room TP 0.03
Contact: Alexander Altland