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arXiv 0810.1846cond-mat.dis-nn
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一维对角无序链的安德森局域化判据的计算

Calculation of Anderson localization criterium for a one dimensional chain with diagonal disorder

G. G. Kozlov

摘要:

对于一个对角无序的一维半无限长链,如果在$t=0$处激发局限于边缘位置(Anderson准则),我们计算了在边缘位置处平均激发密度的最终值$D$,即在$t\to\infty$处的值.我们得到了以下结果:(1)对于二元无序链,我们导出了$D$的封闭表达式,它在低缺陷浓度范围内是精确的,并且对任意缺陷能量$\varepsilon$都是有效的。在这种情况下,$D$证明对$\varepsilon$无分析依赖性。ii)对于任意小的无序,得到了$D$的近似表达式。iii)计算了具有特定能量的态对$D$的相对贡献。所得结果与计算机模拟结果完全一致。

英文摘要:

For a one dimensional half-infinite chain with diagonal disorder we calculated the ultimate at $t\to\infty$ value of the average excitation density at the edge site $D$ if at $t=0$ the excitation was localised at the edge site (Anderson' s creterium). We obtained the following results: i) for the binary disordered chain we derived the close expression for $D$ which is exact in the limit of low concentration of defects and is valid for an arbitrary energy of defects $\varepsilon$. In this case $D$ demonstrated the non analytical dependence on $\varepsilon$. ii) The close expression for $D$ is obtained for the case of an arbitrary small disorder. iii) The relative contribution of states with specified energy to $D$ is calculated. All the results obtained are in complete agreement with computer simulation.

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