Séminaire de Physique Théorique

Quantum magnets, gauge theories and anomalies
Tin Sulejmanpasic (ENS, Paris)
Thursday 22 February 2018 14:00 -  Tours -  Salle 1180 (Bât E2)

Résumé :
I will discuss setups of effective field theories which describe various spin systems. They can typically be expressed as U(1) gauge theories. Such theories may have 't Hooft, anomalies which must be matched by nontrivial ground states (i.e. they cannot be gapped and not have any long range order). As a result such systems always have interesting IR physics. They either break some global symmetries, are gapless or have some long-range topological order. I will discuss some possible scenarios in 1+1D and 2+1D spin systems.

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