Physical Review E
Efficient parallel tempering for first-order phase transitions
T. Neuhaus, Martin P. Magiera, Ulrich H. E. Hansmann
Abstract
We present a Monte Carlo algorithm that facilitates efficient parallel tempering simulations of the density of states g(E) . We show that the algorithm eliminates the supercritical slowing down in the case of the Q=20 and Q=256 Potts models in two dimensions, typical examples for systems with extreme first-order phase transitions. As recently predicted, and shown here, the microcanonical heat capacity along the calorimetric curve has negative values for finite systems.