Abstract
We obtain numerically a scale-invariant distribution of the bandwidths for the critical Harper model, which is closely described by a semi-Poisson curve. After a suitable unfolding of spectra, derived from different boundary conditions, a semi-Poisson level spacing distribution and a sub-Poisson linear number variance are deduced from the bandwidth distribution. The obtained results support possible universality of the critical spectral statistics and suggest its connection to spectral multifractality.
- Received 24 February 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.1643
©2000 American Physical Society