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arXiv math-ph/0510063math-phmath.MPmath.SP
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具有正则Floquet特征值的周期Schroedinger算子随机扰动的局部化

Localization for random perturbations of periodic Schroedinger operators with regular Floquet eigenvalues

Ivan Veselic'

摘要:

证明了连续遍历薛定谔算子$ H_ω:= H_0 + V_ω$的一个局部化定理,其中随机势$ V_ω$是周期算子$ H_0$的非负Anderson型扰动.我们考虑$ σ(H_0) $的较低光谱带边,比如说$ E= 0 $,在由扰动$ V_ω$保持的间隙处。假设$ H_0$的所有Floquet特征值都有一个正定的Hessian,我们得出结论:存在一个包含0的区间$ I $,使得对于几乎所有的$ ω$,$ H_ω$在$ I $中只有纯点谱.

英文摘要:

We prove a localization theorem for continuous ergodic Schrödinger operators $ H_ω:= H_0 + V_ω$, where the random potential $ V_ω$ is a nonnegative Anderson-type perturbation of the periodic operator $ H_0$. We consider a lower spectral band edge of $ σ(H_0) $, say $ E= 0 $, at a gap which is preserved by the perturbation $ V_ω$. Assuming that all Floquet eigenvalues of $ H_0$, which reach the spectral edge 0 as a minimum, have there a positive definite Hessian, we conclude that there exists an interval $ I $ containing 0 such that $ H_ω$ has only pure point spectrum in $ I $ for almost all $ ω$.

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