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We show that suppression of vortices in the Ashkin Teller ferromagnet on asquare lattice splits the order-disorder transition and opens up anintermediate phase where the macroscopic symmetry enhances to U(1). When weselectively suppress the formation of non-chiral vortices, chiral vorticesproliferate and replace the U(1) phase with a new phase where chiral symmetryis restored. This result demonstrates a fascinating phenomenon in which thesymmetry information encoded in topological defects manifests itself in thesymmetry of the phase where the defects proliferate. We also show that thisphenomenon can occur in all $\mathbb{Z}_n$ ferromagnets with even values of$n$.

U(1) Emergence versus Chiral Symmetry Restoration in the Ashkin Teller Model