Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.36: Poster
Donnerstag, 29. März 2007, 16:00–18:00, Poster D
Structural Transitions of Three-dimensional Homopolymers on Regular Lattices — •Thomas Vogel1, Michael Bachmann1,2, and Wolfhard Janke1 — 1Institute for Theoretical Physics, University Leipzig, PF 100920, 04109 Leipzig, Germany — 2Complex Systems Division, Lund University, Sweden
We employ recently developed flat histogram extensions [1,2] of the pruned-enriched Rosenbluth method (PERM) [3] to study the freezing collapse of flexible polymers on simple cubic (sc) and face-centered cubic (fcc) lattices at temperatures well below the Θ-transition. We find that the freezing collapse does not scale with the system size in this model, besides some fluctuations due to the underlying lattice. It dominates the thermodynamic behavior of small systems but becomes unimportant in the long-chain limit.
Our work was motivated by a recent study of another related system. The crystallization temperature there depends on the polymer length and coincides with the Θ-transition in the thermodynamic limit [4].
[1] M. Bachmann, W. Janke, Phys. Rev. Lett. 91 (2003) 208 105.
[2] T. Prellberg, J. Krawczyk, Phys. Rev. Lett. 92 (2004) 120 602.
[3] P. Grassberger, Phys. Rev. E 56 (1997) 3682.
[4] F. Rampf, W. Paul, K. Binder, Europhys. Lett. 70 (2005) 628.