Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Phase transitions

O 39.5: Vortrag

Dienstag, 23. März 2010, 16:00–16:15, H42

Lattice Gas Monte Carlo Simulations of Pentacene on Cu (110) - (2 × 1)O — •Johannes Gall, Michael Hohage, Chunyang Liu, Daniel Queteschiner, Günther Weidlinger, Lidong Sun, and Peter Zeppenfeld — Institute of Experimental Physics, Johannes Kepler University, Linz, Austria.

A reversible two-dimensional phase transition of pentacene (5A) submonolayer films on the Cu(110) - (2 × 1)O reconstructed surface has been observed. Several Monte Carlo (MC) and Kinetic Monte Carlo (KMC) simulations of a lattice gas Ising model have been performed to understand the behavior of the system. The combination of MC and KMC simulations allows investigating the role of kinetic processes during the phase transition. In the simulations different interaction models have been investigated. In particular, we find that the characteristics of the phase transitions strongly depend on the anisotropy of the lateral interactions. The simulation results are compared to recent RDS (reflectance difference spectroscopy) and STM (scanning tunneling microscopy) experiments.