Nonlinear sigma models at nonzero chemical potential: Breaking up instantons and the phase diagram

Bruckmann, Falk ; Sulejmanpasic, Tin

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Zusammenfassung

We consider asymptotically free nonlinear sigma models in two dimensions which, due to their internal symmetries, allow for a conserved charge. Introducing nonzero chemical potential for the SO(2) subgroup of the symmetry group, we discuss two expected phase transitions, which are related to charge condensation and percolation of merons, respectively. The latter are topological objects with half ...