Quantum chaotic patterns in the E x (b_1+b_2) Jahn-Teller model
arXiv:cond-mat/0510710 · doi:10.1103/PhysRevE.73.057202
Abstract
We study statistical properties of excited levels of the E x (b_1+b_2) Jahn-Teller model. The multitude of avoided crossings of energy levels is generally claimed to be a testimony of quantum chaos. We found that apart from two limiting cases (E x e and Holstein model) the distribution of nearest-neighbor spacings is rather stable as to the change of parameters and different from the Wigner one. This limiting distribution assumably shows scaling ~ at small S and resembles the semi-Poisson law P(S)= 4S \exp (-2 S) at S> 1. The latter is believed to be universal and characteristic, e.g., at the transition between metal and insulator phases.
5 figs, 4 pages, published in Phys.Rev.E; sequel of cond-mat/0509687
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