Abstract
We consider the finite-temperature phase diagram of a classical effective model of charged collective vortex excitations in incompressible states with spontaneous interlayer coherence in double layer quantum Hall systems. The phase diagram exhibits surprisingly rich structure, including a Kosterlitz-Thouless transition at high core energy, crystal phases at low core energy, and a variety of transitions between the phases. Our results suggest that alternatives to the expected Kosterlitz-Thouless transition are possible in double layer quantum Hall systems.
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