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arXiv math-ph/0310033math-phmath.MP
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由各向异性衰变引起的Lifshits尾:量子经典状态的出现

Lifshits tails caused by anisotropic decay: the emergence of a quantum-classical regime

Werner Kirsch, Simone Warzel

摘要:

本文研究了一类具有正随机势的薛定谔算符的积分态密度的Lifshits尾行为。设置包括合金型和泊松随机势。所考虑的(单点)杂质势$f: \mathbbm{R}^d \to [0, \infty[ $在无穷远处以各向异性方式衰减,例如,$f(x_1,x_2)\sim (|x_1|^{α_1}+|x_2|^{α_2})^{-1}$为$ |(x_1,x_2)| \to \infty $。正如从各向同性情况所预期的,如果$α_1$和$α_2$都足够大,则存在具有Lifshits指数$ d/2 $的所谓量子区域,并且如果两者都很小,则存在具有依赖于$α_1$和$α_2$的Lifshits指数的所谓经典区域。除此之外,我们发现两个新的制度的Lifshits指数表现出量子和经典行为的混合物。此外,这些制度之间的过渡线在一个非平凡的方式依赖于$ α_1$和$α_2$同时。

英文摘要:

We investigate Lifshits-tail behaviour of the integrated density of states for a wide class of Schrödinger operators with positive random potentials. The setting includes alloy-type and Poissonian random potentials. The considered (single-site) impurity potentials $f: \mathbbm{R}^d \to [0, \infty[ $ decay at infinity in an anisotropic way, for example, $f(x_1,x_2)\sim (|x_1|^{α_1}+|x_2|^{α_2})^{-1}$ as $ |(x_1,x_2)| \to \infty $. As is expected from the isotropic situation, there is a so-called quantum regime with Lifshits exponent $ d/2 $ if both $α_1$ and $α_2$ are big enough, and there is a so-called classical regime with Lifshits exponent depending on $α_1$ and $α_2$ if both are small. In addition to this we find two new regimes where the Lifshits exponent exhibits a mixture of quantum and classical behaviour. Moreover, the transition lines between these regimes depend in a nontrivial way on $ α_1$ and $α_2$ simultaneously.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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