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The two-dimensional Anderson model of localization with random hopping

机译:带有随机跳变的二维安德森定位模型

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摘要

We examine the localization properties of the 2D Anderson Hamiltonian with off-diagonal disorder. Investigating the behavior of the participation numbers of eigenstates as well as studying their multifractal properties, we find states in the center of the band which show critical behavior up to the system size N = 200 * 200 considered. This result is confirmed by an independent analysis of the localization lengths in quasi-1D strips with the help of the transfer-matrix method. Adding a very small additional onsite potential disorder, the critical states become localized.
机译:我们检查了具有非对角线紊乱的2D Anderson Hamiltonian的定位特性。通过调查本征态参与数的行为以及研究其多重分形特性,我们发现在频带中心的状态在系统规模N = 200 * 200时显示出临界行为。借助于转移矩阵方法,通过对准一维条带中的定位长度进行了独立分析,证实了这一结果。加上非常小的附加现场潜在疾病,临界状态就变得局部化了。

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