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arXiv 0902.4153cond-mat.stat-mechcond-mat.dis-nn
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高斯和+/-J伊辛自旋玻璃多临界点的位置和性质

On locations and properties of the multicritical point of Gaussian and +/-J Ising spin glasses

S. L. A. de Queiroz

摘要:

本文利用转移矩阵和有限尺寸标度方法研究了二维正方形、三角形和蜂窝形晶格上具有二元和高斯无序分布的伊辛自旋玻璃的多临界点的位置和性质。对于正方形和三角形格子与二进制的混乱,估计的多临界点的位置是在数值协议与最近的apturtures关于其确切位置。对于其余四种情况,我们的结果表明与相应版本的猜想不一致,尽管数量很小,从未超过0.2%。我们的结果:(i)控制铁磁-顺磁跃迁的相关长度指数$ν$,(ii)临界畴壁能量振幅$η$,(iii)共形反常$c$,(iv)有限尺寸磁化率指数$γ/ν$ ;以及(v)与多临界点处自旋-自旋关联函数的概率分布的矩相关联的多分形指数集$\{η_k \}$,的晶格结构和无序分布的普适性是一致的,并与现有的估计很好的协议。

英文摘要:

We use transfer-matrix and finite-size scaling methods to investigate the location and properties of the multicritical point of two-dimensional Ising spin glasses on square, triangular and honeycomb lattices, with both binary and Gaussian disorder distributions. For square and triangular lattices with binary disorder, the estimated position of the multicritical point is in numerical agreement with recent conjectures regarding its exact location. For the remaining four cases, our results indicate disagreement with the respective versions of the conjecture, though by very small amounts, never exceeding 0.2%. Our results for: (i) the correlation-length exponent $ν$ governing the ferro-paramagnetic transition; (ii) the critical domain-wall energy amplitude $η$; (iii) the conformal anomaly $c$; (iv) the finite-size susceptibility exponent $γ/ν$; and (v) the set of multifractal exponents $\{η_k \}$ associated to the moments of the probability distribution of spin-spin correlation functions at the multicritical point, are consistent with universality as regards lattice structure and disorder distribution, and in good agreement with existing estimates.

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