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Energy level statistics in the transition region between integrability and chaos
Prosen, Tomaž, 1970- ; Robnik, Marko, 1954-
A generic one-parameter family of billiards discovered and introduced by Robnik (1983) is used to study the spectral properties of corresponding quantum systems. When the parameter is varied a smooth ...transition from an integrable system over a typical KAM system to an almost ergodic system can be observed. We calculate up to 7600 lowest reliable energy levels. A detailed analysis of the numerical data shows significant deviation from the semiclassical Berry-Robnik formulae for the nearest-neighbour level spacing distribution P(S) except for large level spacings, S>1, which can only be explained by a very slow convergence towards the semiclassical regime where these formulae are predicted to be correct. At small S the powerlaw level repulsion is clearly observed and a fit by the phenomenological formula by Izrailev is statistically significant
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