Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Critical Phenomena and Phase Transitions

DY 25.6: Vortrag

Donnerstag, 14. März 2013, 10:45–11:00, H46

Phase Transitions in Classical Lattice Gases with Three-Body Interactions — •Georg Maximilian Lohöfer — Institute for Theoretical Solid State Physics, RWTH Aachen University, Germany

We study a classical lattice gas on a honeycomb lattice in the parameter region where three-body interactions are dominant. Employing Monte Carlo simulations utilizing parallel tempering, we explore the complex low energy manifold, where highly-degenerate states for different values of the chemical potential emerge, resulting from the frustrated nature of three-body repulsions on the hexagonal lattice structure. We analyse the thermal phase transitions out of these low-temperature phases and identify a four-states Potts model transition that can be traced back to a partial re-ordering from an extensive ground state degeneracy at finite temperatures.