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arXiv 0810.4532cond-mat.dis-nn
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长程一维紧束缚模型中安德森局域化的微扰判据

Perturbative criteria for Anderson localization in long-ranged 1D tight-binding models

Shimul Akhanjee

摘要:

我们开发了一种替代的缩放方法来确定标准的安德森局域化在一维紧束缚模型与随机网站的能量具有带宽,衰减的幂律在空间中,$H_{ij} \propto |i - j|^{-α}$。在微扰理论的一阶交换窄化的能量的无序的尺度依赖性进行比较的能级间距的理想系统,以建立是否有一个扰动的影响,无序的布洛赫状态。我们发现,在$α=1$,微扰条件得到满足,并为足够弱的无序强度的所有状态被扩展。对于$α> 1$,所有的状态是本地化的任意无序强度,与早期的重整化群治疗Levitov。

英文摘要:

We develop an alternative scaling approach to determine the criteria for Anderson localization in one-dimensional tight-binding models with random site energies having a bandwidth that decays as a power law in space, $H_{ij} \propto |i - j|^{-α}$. At the first order in perturbation theory the scale dependence of the exchange-narrowed energy of the disorder is compared to the energy level spacing of the ideal system to establish whether or not the disorder has a perturbative effect on the Bloch states. We find that at $α=1$, the perturbative condition is satisfied and for sufficiently weak disorder strength all states are extended. For $α> 1$, all states are localized for arbitrary disorder strength, in agreement with the earlier renormalization group treatment by Levitov.

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