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arXiv 0712.2009cond-mat.dis-nn
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磁场中Ising自旋玻璃的行为

Behavior of Ising Spin Glasses in a Magnetic Field

Thomas Jorg, Helmut G. Katzgraber, Florent Krzakala

摘要:

我们研究了自旋玻璃相的存在,在一个字段中使用蒙特卡罗模拟沿非平凡的路径进行的字段-温度平面,必须跨越任何假定的德阿尔梅达-无核不稳定线。该方法首先测试的伊辛自旋玻璃上的Bethe晶格的不稳定线分离的自旋玻璃的顺磁状态也计算分析。虽然不稳定线再现我们的模拟平均场贝特晶格,没有这样的不稳定线可以找到数值的短程三维模型。

英文摘要:

We study the existence of a spin-glass phase in a field using Monte Carlo simulations performed along a nontrivial path in the field--temperature plane that must cross any putative de Almeida-Thouless instability line. The method is first tested on the Ising spin glass on a Bethe lattice where the instability line separating the spin glass from the paramagnetic state is also computed analytically. While the instability line is reproduced by our simulations on the mean-field Bethe lattice, no such instability line can be found numerically for the short-range three-dimensional model.

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