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arXiv 1206.3370cond-mat.dis-nncond-mat.mes-hall
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实空间长程关联无序一维系统的单参数标度

Single parameter scaling of one-dimensional systems with real-space long-range correlated disorder

Greg Petersen, Nancy Sandler

摘要:

随着材料生长方法的发展,一维系统在无标度长程关联无序势作用下的局域化问题又引起了人们的兴趣。我们分析了在相关性存在的情况下,远离带中心的β函数的单参数标度的有效性。一个重整化的无序强度出现减少单参数标度假设的有效性制度。本地化长度和参与率的分析导致相关依赖的临界和分形指数,与扩展的Harris准则一致。

英文摘要:

Advances in material growth methods have renewed the interest in localization of one-dimensional systems in the presence of scale-free long-range correlated disorder potentials. We analyze the validity of single parameter scaling for the β-function away from the band center, in the presence of correlations. A renormalized disorder strength emerges reducing the regime of validity of the single parameter scaling hypothesis. Analysis of localization lengths and participation ratios leads to correlation dependent critical and fractal exponents, consistent with the extended Harris criterion.

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