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- W2950793456 abstract "We studied complex spectra of a two-level electron system coupled to two phonon (vibron) modes represented by the E$otimes$e Jahn-Teller model. For particular rotation quantum numbers we found a coexistence of up to three regions of the spectra, (i) the dimerized region of long-range ordered (extended) pairs of oscillating levels, (ii) the short-range-ordered (localized) lattice of avoiding levels, and (iii) the intermediate region of kink nucleation with variable range of ordering. This structure appears above a certain critical line as a function of interaction strength. The level clustering and level avoiding generic patterns reflect themselves in several intermittent regions between up to three branches of spectral entropies. Linear scaling behavior of the widths of level curvature probability distributions provides the conventionally adopted indication for the presence of quantum chaos. Level spacing probability distributions show peculiarities of the partial (for fixed quantum angular momentum) as well as of the cumulative (all angular momenta) case. The clustering of levels with two and three dominant spacings at fixed angular momenta causes notable deviations of the cumulative distributions from the Poissonian one." @default.
- W2950793456 created "2019-06-27" @default.
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- W2950793456 date "2005-09-27" @default.
- W2950793456 modified "2023-09-27" @default.
- W2950793456 title "Quantum chaotic patterns and clustering in spectra of a two-level boson model" @default.
- W2950793456 hasPublicationYear "2005" @default.
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