A generalized Monte Carlo loop algorithm for frustrated Ising models

Details A generalized Monte Carlo loop algorithm for frustrated Ising models A generalized Monte Carlo loop algorithm for frustrated Ising models

2010-07-21

arxiv.org/abs/1007.3754v1

Phys. Rev. E 85, 036704 (2012)

Physics

Condensed Matter

Statistical Mechanics

14 pages, 12 figures

Scientific paper

10.1103/PhysRevE.85.036704

We introduce a Generalized Loop Move (GLM) update for Monte Carlo simulations of frustrated Ising models on two-dimensional lattices with bond-sharing plaquettes. The GLM updates are designed to enhance Monte Carlo sampling efficiency when the system's low-energy states consist of an extensive number of degenerate or near-degenerate spin configurations, separated by large energy barriers to single spin flips. Through implementation on several frustrated Ising models, we demonstrate the effectiveness of the GLM updates in cases where both degenerate and near-degenerate sets of configurations are favored at low temperatures. The GLM update's potential to be straightforwardly extended to different lattices and spin interactions allow it to be readily adopted on many other frustrated Ising models of physical relevance.

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