Quantum dots in magnetic fields: Phase diagram and broken symmetry at the maximum-density-droplet edge

Quantum dots in magnetic fields are studied within the current spin-density -functional formalism avoiding any spatial symmetry restrictions of the sol utions. We find that the maximum-density droplet reconstructs into states w ith broken internal symmetry: The Chamon-Wen edge coexists with a modulatio n of the charge density along the edge. The phase boundaries between the po larization transition, the maximum-density droplet, and its reconstruction are in agreement with recent experimental results.