Blume-Capel model analysis with microcanonical population annealing method
This work provides incremental improvements for researchers in statistical physics by analyzing a specific spin model with a modified algorithm.
The authors tackled the problem of estimating the density of states for a two-dimensional Blume-Capel model by modifying the Rose-Machta algorithm, simulating 10^5 replicas in parallel, and performed finite-size analysis to determine critical temperature and exponents, with results in good agreement with previous methods.
We present a modification of the Rose-Machta algorithm (Phys. Rev. E 100 (2019) 063304) and estimate the density of states for a two-dimensional Blume-Capel model, simulating $10^5$ replicas in parallel for each set of parameters. We perform a finite-size analysis of the specific heat and Binder cumulant, determine the critical temperature along the critical line, and evaluate the critical exponents. The results obtained are in good agreement with those obtained previously using various methods -- Markov Chain Monte Carlo simulation, Wang-Landau simulation, transfer matrix, and series expansion. The simulation results clearly illustrate the typical behavior of specific heat along the critical lines and through the tricritical point.