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arXiv cond-mat/9908063cond-mat.dis-nncond-mat.mtrl-sci
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准周期紧束缚模型中的普适能级间距统计量

Universal level-spacing statistics in quasiperiodic tight-binding models

Uwe Grimm, Rudolf A. Roemer, Michael Schreiber, Jian-Xin Zhong

摘要:

研究了二维准周期紧束缚模型能谱的统计性质。这些模型的本征态的多重分形性质是由参与数与系统大小的比例来证实的。因此,人们可能已经预期的“临界”或“中间”统计的水平间距分布所观察到的金属-绝缘体过渡的三维安德森模型的无序。然而,我们的数值计算结果与高斯正交随机矩阵系综的普遍能级间距分布完全一致,包括第二,第三和第四相邻能级之间的间距分布。

英文摘要:

We study statistical properties of the energy spectra of two-dimensional quasiperiodic tight-binding models. The multifractal nature of the eigenstates of these models is corroborated by the scaling of the participation numbers with the systems size. Hence one might have expected `critical' or `intermediate' statistics for the level-spacing distributions as observed at the metal-insulator transition in the three-dimensional Anderson model of disorder. However, our numerical results are in perfect agreement with the universal level-spacing distributions of the Gaussian orthogonal random matrix ensemble, including the distribution of spacings between second, third, and forth neighbour energy levels.

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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