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arXiv math-ph/0411068math-phmath.MPmath.SP
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随机酉算子的分数阶矩估计

Fractional Moment Estimates for Random Unitary Operators

Alain Joye

摘要:

我们考虑由乘积$U_ω=D_ωS$定义的$l^2(\Z^d)$上的$d-$维Anderson模型的幺正类似物,其中$S$是确定性幺正,$D_ω$是i.i.d.随机相位算子$S$是一个绝对连续的带矩阵,它依赖于控制其非对角元素大小的参数。我们采用Aizenman-Molchanov方法得到$U_ω(U_ω-z)^{-1}$矩阵元素分数阶矩的指数估计,条件是相位分布是绝对连续的,并且参数对应于$S$的小非对角元素.这样的估计意味着$U_ω$几乎肯定是本地化的。

英文摘要:

We consider unitary analogs of $d-$dimensional Anderson models on $l^2(\Z^d)$ defined by the product $U_ω=D_ωS$ where $S$ is a deterministic unitary and $D_ω$ is a diagonal matrix of i.i.d. random phases. The operator $S$ is an absolutely continuous band matrix which depends on parameters controlling the size of its off-diagonal elements. We adapt the method of Aizenman-Molchanov to get exponential estimates on fractional moments of the matrix elements of $U_ω(U_ω-z)^{-1}$, provided the distribution of phases is absolutely continuous and the parameters correspond to small off-diagonal elements of $S$. Such estimates imply almost sure localization for $U_ω$.

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