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arXiv 1407.4891cond-mat.stat-mech
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一维长程相互作用随机场伊辛模型的临界行为

Critical behavior of the random-field Ising model with long-range interactions in one dimension

Ivan Balog, Gilles Tarjus, Matthieu Tissier

摘要:

利用非微扰泛函重整化群研究了具有长程相互作用的一维随机场伊辛模型(Rsing)($\propto r^{-(d+σ)}$)的临界行为.我们发现两个不同的制度的关键行为作为一个功能的$σ$,分开的临界值$σ_c$。区分这两种制度的是存在或不存在的尖点样的非解析性的功能依赖的重正化累积量的随机场在固定点。这种行为的变化可以与系统中存在的大规模雪崩在零温度下的特性。我们提出了通过晶格模拟来检查这些预测的方法。我们还讨论了与Dyson等级格上的Rynn的区别。

英文摘要:

We study the critical behavior of the one-dimensional random field Ising model (RFIM) with long-range interactions ($\propto r^{-(d+σ)}$) by the nonperturbative functional renormalization group. We find two distinct regimes of critical behavior as a function of $σ$, separated by a critical value $σ_c$. What distinguishes these two regimes is the presence or not of a cusp-like nonanalyticity in the functional dependence of the renormalized cumulants of the random field at the fixed point. This change of behavior can be associated to the characteristics of the large-scale avalanches present in the system at zero temperature. We propose ways to check these predictions through lattice simulations. We also discuss the difference with the RFIM on the Dyson hierarchical lattice.

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