Distribution of the spacing between two adjacent avoided crossings

Details Distribution of the spacing between two adjacent avoided crossings Distribution of the spacing between two adjacent avoided crossings

2005-09-29

arxiv.org/abs/nlin/0509054v1

Nonlinear Sciences

Chaotic Dynamics

11 pages

Scientific paper

10.1103/PhysRevE.72.056206

We consider the frequency at which avoided crossings appear in an energy level structure when an external field is applied to a quantum chaotic system. The distribution of the spacing in the parameter between two adjacent avoided crossings is investigated. Using a random matrix model, we find that the distribution of these spacings is well fitted by a power-law distribution for small spacings. The powers are 2 and 3 for the Gaussian orthogonal ensemble and Gaussian unitary ensemble, respectively. We also find that the distributions decay exponentially for large spacings. The distributions in concrete quantum chaotic systems agree with those of the random matrix model.

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