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Distribution of the spacing between two adjacent avoided crossings

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arxiv nlin/0509054 v1 pith:K7UGQ2V4 submitted 2005-09-29 nlin.CD

Distribution of the spacing between two adjacent avoided crossings

classification nlin.CD
keywords distributionavoidedcrossingsspacingsadjacentchaoticdistributionsensemble
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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