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 intralevel parametric velocity correlation function and the distribution of level shifts under the influence of an arbitrary external perturbation.
- Received 18 July 2002
DOI:https://doi.org/10.1103/PhysRevE.67.025202
©2003 American Physical Society