Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 66: Poster: Stat. Phys. (Gen., Critical Phen., Biol.)
DY 66.16: Poster
Thursday, March 15, 2018, 15:30–18:00, Poster A
Two Perspectives on the Condensation-Evaporation Transition — •Franz Paul Spitzner1, Johannes Zierenberg1,2, and Wolfhard Janke1 — 1Institut für Theoretische Physik, Universität Leipzig Postfach 100 920, 04009 Leipzig, Germany — 2Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany
The particle condensation-evaporation transition is a standard example of a first-order phase transition. In equilibrium, the consideration may be reduced to the coexistence of a homogeneous gas phase and an inhomogeneous phase consisting of a single macroscopic droplet with surrounding vapour. The transition can either be driven by density or temperature -- keeping the respective ``orthogonal'' quantity constant. While this problem can be rigorously treated only at fixed temperature and in two dimensions, a heuristic derivation of the leading-order finite-size scaling behaviour exists that holds for the transition at fixed temperature and at fixed density.
We present how the well known multicanonical method can be adopted to the grand canonical ensemble, allowing us to investigate the condensation-evaporation transition of a 2D Lennard-Jones gas in both regimes. The careful adjustment of simulation parameters and subtle implementation choices will be discussed, in order to provide insight into the method and consistent results that support the existing prediction of the scaling behaviour.