Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-11-29
J.Phys.A:Math.Theor 41 (2008) 155102
Physics
Condensed Matter
Soft Condensed Matter
17 pages, 9 figures; published in J.Phys.A; sequel of Phys.Rev.E v.73, 057202 (2006) [cond-mat/0510710]
Scientific paper
10.1103/PhysRevE.73.057202
The long-range spectral density correlations (spectral rigidities $\bar{\Delta}_3(\bar n)$ and related spectral compressibilities) of the $E\otimes (b_1+b_2)$ Jahn-Teller model are found strongly nonuniversal with respect to the Hamiltonian parameters and inhomogeneous with respect to the choice of a partial energy segment. However, the spectral compressibilities found for the partial spectral segments and averaged over a whole relevant part of the spectrum cumulate close to a well-defined limit pertaining to the semi-Poisson statistics. This is in accordance with similar tendencies revealed in the short-range averaged statistical characteristics of this model investigated in our previous paper [1]. We ascribe the nonuniversal and inhomogeneous nonintegrability behaviour to the changing degree of the brokening of the rotation symmetry when changing parameters of our effectively two-dimensional model. It results in a random distribution of the respective localized wave functions at all scales up to the size of an available state space. The multifractal behaviour of the wave functions is implied from the analysis of their (averaged) fractal dimensions which range up to $1.5\pm 0.1$ (for $\bar{D}_2$). This might imply the concept of the chaos-assisted tunnelling between the regions of reduced degree of stochasticity through regions of high degree of stochasticity. It supports the analogy with the two-dimensional Anderson model with marginal-asymptotically far metal-insulator transition. The features found allow us to classify the present model as a member of the class with a multifractal eigenfunction statistics characteristic for the spectra with weakened level repulsion similar to the Anderson model close to the metal-insulator transition.
Majernikova Eva
Shpyrko Serge
No associations
LandOfFree
Marginal intermediate statistics in the excited spectra of E\otimes (b_1+b_2) Jahn-Teller systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Marginal intermediate statistics in the excited spectra of E\otimes (b_1+b_2) Jahn-Teller systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Marginal intermediate statistics in the excited spectra of E\otimes (b_1+b_2) Jahn-Teller systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-372439