Two-dimensional lattice polymers: adaptive windows simulations

Details Two-dimensional lattice polymers: adaptive windows simulations Two-dimensional lattice polymers: adaptive windows simulations

2008-10-04

arxiv.org/abs/0810.0739v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 5 figures

Scientific paper

10.1016/j.cpc.2008.12.015

We report a numerical study of self-avoiding polymers on the square lattice, including an attractive potential between nonconsecutive monomers. Using Wang-Landau sampling (WLS) with adaptive windows, we obtain the density of states for chains of up to N=300 monomers and associated thermodynamic quantities. The method enables one to simulate accurately the low-temperature regime, which is virtually inaccessible using traditional methods. Instead of defining fixed energy windows, as in usual WLS, this method uses windows with boundaries that depend on the set of energy values on which the histogram is flat at a given stage of the simulation. Shifting the windows each time the modification factor $f$ is reduced, we eliminate border effects that arise in simulations using fixed windows.

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