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arXiv 0708.1889cond-mat.dis-nncond-mat.stat-mech
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随机Husimi晶格中Edwards-Anderson模型的零温度解

Zero temperature solutions of the Edwards-Anderson model in random Husimi Lattices

A. Lage-Castellanos, R. Mulet

摘要:

我们在不同的Husimi格点上求解了Edwards-Anderson模型。我们表明,在T=0时,解空间的结构取决于循环大小的奇偶性。具有奇数圈大小的Husimi晶格总是有一个平凡的顺磁解在1 RSB扰动下稳定,而在具有偶数圈大小的Husimi晶格中,该解不存在。根据1 RSB扰动的稳定性范围和其他RS解决方案计算解析(如果可能)或数值。在1 RSB近似下计算了不同Husimi晶格的自由能、复杂度和基态能。我们还表明,当铁磁耦合的分数增加时,存在,首先,从顺磁到自旋玻璃相的不连续过渡和从自旋玻璃到铁磁相的连续过渡。

英文摘要:

We solve the Edwards-Anderson model (EA) in different Husimi lattices. We show that, at T=0, the structure of the solution space depends on the parity of the loop sizes. Husimi lattices with odd loop sizes have always a trivial paramagnetic solution stable under 1RSB perturbations while, in Husimi lattices with even loop sizes, this solution is absent. The range of stability under 1RSB perturbations of this and other RS solutions is computed analytically (when possible) or numerically. We compute the free-energy, the complexity and the ground state energy of different Husimi lattices at the level of the 1RSB approximation. We also show, when the fraction of ferromagnetic couplings increases, the existence, first, of a discontinuous transition from a paramagnetic to a spin glass phase and latter of a continuous transition from a spin glass to a ferromagnetic phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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