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arXiv 0903.0028math-phmath.MP
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酉Anderson模型的动力学局部化

Dynamical Localization for Unitary Anderson Models

Eman Hamza, Alain Joye, Günter Stolz

摘要:

本文建立了d维格上某些酉随机算子族在不同区域的动力学局部化性质。这些算子是量子输运的一维物理模型的推广,并从与固态物理学的离散安德森模型的类比中得出它们的名字。它们是确定性酉算子和随机酉算子的乘积。确定性算子具有能带结构,是绝对连续的,并且起到离散拉普拉斯算子的作用。随机算子与由i.i.d.给出的元素成对角线。随机相位按一定的绝对连续测度分布,起着随机势的作用。在一维上,这些算子属于单位圆上正交多项式理论中的CMV-矩阵族。我们实现的方法Aizenman-Molchanov证明指数衰减的格林函数的分数阶矩的幺正安德森模型在以下三个制度:在任何维度,在整个光谱在大的混乱和附近的带边在任意的混乱,并在一维,在整个光谱在任意的混乱。我们还证明了格林函数的分数阶矩的指数衰减意味着动力学局部化,这反过来又意味着谱局部化。这些结果完成了与自伴的情况下,动力学本地化是真实的,在相同的三个制度的类比。

英文摘要:

This paper establishes dynamical localization properties of certain families of unitary random operators on the d-dimensional lattice in various regimes. These operators are generalizations of one-dimensional physical models of quantum transport and draw their name from the analogy with the discrete Anderson model of solid state physics. They consist in a product of a deterministic unitary operator and a random unitary operator. The deterministic operator has a band structure, is absolutely continuous and plays the role of the discrete Laplacian. The random operator is diagonal with elements given by i.i.d. random phases distributed according to some absolutely continuous measure and plays the role of the random potential. In dimension one, these operators belong to the family of CMV-matrices in the theory of orthogonal polynomials on the unit circle. We implement the method of Aizenman-Molchanov to prove exponential decay of the fractional moments of the Green function for the unitary Anderson model in the following three regimes: In any dimension, throughout the spectrum at large disorder and near the band edges at arbitrary disorder and, in dimension one, throughout the spectrum at arbitrary disorder. We also prove that exponential decay of fractional moments of the Green function implies dynamical localization, which in turn implies spectral localization. These results complete the analogy with the self-adjoint case where dynamical localization is known to be true in the same three regimes.

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