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arXiv 1107.3058math.PRmath-phmath.MP
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临界一维随机Schrodinger算子的标度极限

The scaling limit of the critical one-dimensional random Schrodinger operator

Evgenij Kritchevski, Benedek Valko, Balint Virag

摘要:

本文考虑一维离散随机Schrodinger算子(H_n)_l = H_{l-1}+ H_{l +1}+v_l_l_l,H_0 = H_{n+1}=0的两种模型:v_k=σω_k/ \sqrt{n}和v_k=σω_k/ \sqrt{k} .这里ω_k是独立的随机变量,均值为0,方差为1。我们表明,本征向量是离域的和传输矩阵的演变有一个随机微分方程给出的标度限制。在这两种情况下,接近固定体能量E的本征值都有一个点过程极限。给出了本征值排斥、大能隙几率的界,确定了极限强度,并给出了一个中心极限定理。在第二个模型中,极限过程是相同的点过程作为随机矩阵理论的β-系综的批量标度极限。在第一个模型中,特征值排斥要强得多。

英文摘要:

We consider two models of one-dimensional discrete random Schrodinger operators (H_n ψ)_l =ψ_{l-1}+ψ_{l +1}+v_l ψ_l, ψ_0=ψ_{n+1}=0 in the cases v_k=σω_k/\sqrt{n} and v_k=σω_k/ \sqrt{k}. Here ω_k are independent random variables with mean 0 and variance 1. We show that the eigenvectors are delocalized and the transfer matrix evolution has a scaling limit given by a stochastic differential equation. In both cases, eigenvalues near a fixed bulk energy E have a point process limit. We give bounds on the eigenvalue repulsion, large gap probability, identify the limiting intensity and provide a central limit theorem. In the second model, the limiting processes are the same as the point processes obtained as the bulk scaling limits of the beta-ensembles of random matrix theory. In the first model, the eigenvalue repulsion is much stronger.

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