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Parametric Statistics of Individual Energy Levels in Random Hamiltonians

I. E. Smolyarenko, B. D. Simons

cond-matarXiv:cond-mat/0207456

Abstract

We establish a general framework to explore parametric statistics of individual energy levels in disordered and chaotic quantum systems of unitary symmetry. The method is applied to the calculation of the universal intra-level parametric velocity correlation function and the distribution of level shifts under the influence of an arbitrary external perturbation.

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