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Level statistics transitions in the spin-boson model

We present the nearest neighbour distribution (NND) and Δ 3 statistics for the spin-boson model. The results show a standard Poisson-Wigner (GOE) transition in the NND for large spin, but the most interesting feature is the existence of a transition between the two extreme types of fluctuation spect...

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Bibliographic Details
Published in:Physics letters. A 1991-05, Vol.155 (2), p.113-116
Main Authors: Lewenkopf, C.H, Nemes, M.C, Marvulle, V, Pato, M.P, Wreszinski, W.F
Format: Article
Language:English
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Summary:We present the nearest neighbour distribution (NND) and Δ 3 statistics for the spin-boson model. The results show a standard Poisson-Wigner (GOE) transition in the NND for large spin, but the most interesting feature is the existence of a transition between the two extreme types of fluctuation spectra: picket-fence or harmonic-oscillator type for S small to Poisson for S large.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(91)90575-S