Abstract
We study the energy spectrum of the strong-coupled superlattice. The barriers affect the energy spectral statistics in a small scale. The nearest-neighbor energy-level distribution P( s) and the spectral rigidity Δ 3( L) demonstrated the GOE (Gaussian Orthogonal Ensemble) distribution. In the whole scale, with the electric field increasing, the spectral rigidity Δ 3( L) changes from the Poisson-type like distribution to the Wigner-type like distribution due to the change of the energy-level long-correlation, while the P( s) indicates that the system demonstrates to be integrable. The near-degeneracy of levels makes the level statistics complex.
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