Perturbation theory for the Rosenzweig-Porter matrix model
Perturbation theory for the Rosenzweig-Porter matrix model
复制标题
Rosenzweig-Porter 矩阵模型的微扰理论
DOI:
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发表时间:
1997
期刊:
影响因子:
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通讯作者:
B. Shapiro
中科院分区:
文献类型:
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作者:
A. Altland;M. Janssen;B. Shapiro
We study an ensemble of random matrices (the Rosenzweig-Porter model) which, in contrast to the standard Gaussian ensemble, is not invariant under changes of basis. We show that a rather complete understanding of its level correlations can be obtained within the standard framework of diagrammatic perturbation theory. The structure of the perturbation expansion allows for an interpretation of the level structure on simple physical grounds, an aspect that is missing in the exact analysis [T. Guhr, Phys. Rev. Lett. 76, 2258 (1996); T. Guhr and A. M"uller-Groeling, J. Math. Phys. 38, 1870 (1997)].