arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.4551cond-mat.stat-mech
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二维场地稀释伊辛模型(kT_{C}(p)/J,p)phase diagram的微正则算法估计

The estimation of (kT_{C}(p)/J, p) phase diagram for two-dimensional site-diluted Ising model using a microcanonical algorithm

B. Kutlu, A. E. Genc

摘要:

利用Creutz元胞自动机的改进微正则算法研究了场地稀释的伊辛模型.微正则算法的基本问题是在场地稀释伊辛模型的模拟中,利用动能的平均值来估计正确的温度。在本研究中,使用依赖于稀释度x=1-p的表达式重新描述了平均动能。使用新表达式计算了温度值,并根据每个稀释度x值的比热峰值估计了临界温度。所得到的相变线(kT_{C}(p)/J,p)与场地稀释伊辛模型的泛函预测符合得很好.模拟是在具有周期性边界条件的正方形晶格上进行的。

英文摘要:

The site-diluted Ising model has been investigated using an improved microcanonical algorithm from Creutz Cellular Automaton. For a microcanonical algorithm, the basic problem is to estimate the correct temperatures using average values of the kinetic energy in the simulations of site-diluted Ising model. In this study, the average kinetic energy has been re-described with an expression dependent on dilution x=1-p. The values of the temperature have been calculated using the new expression and the critical temperatures have been estimated from the peaks of specific heat for each value of dilution x. The obtained phase transition line (kT_{C}(p)/J, p) is in good agreement with functional prediction for the site-diluted Ising model. The simulations were carried out on a square lattice with periodic boundary conditions.

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