Multifractal scaling of electronic transmission resonances in perfect and imperfect Fibonacci δ\delta-function potentials

We present here a detailed multifractal scaling study for the electronic transmission resonances with the system size for an infinitely large one dimensional perfect and imperfect quasiperiodic system represented by a sequence of $\delta$-function potentials. The electronic transmission resonances in the energy minibands manifest more and more fragmented nature of the transmittance with the change of system sizes. We claim that when a small perturbation is randomly present at a few number of sites, the nature of electronic states will change and this can be understood by studying the electronic transmittance with the change of system size. We report the different critical states manifested in the size variation of the transmittance corresponding to the resonant energies for both perfect and imperfect cases through multifractal scaling study for few of these resonances.Comment: 7 pages, (Hard copies of 5 figures available on request from [email protected]

Aperiodic order and quasicrystals: spectral properties

We present spectral theoretic results for Hamiltonians associated with Delone sets. For a family of discrete models we characterize the appearance of jumps in the integrated density of states. For a family of continuum models on the set of all Delone sets with suitable parameters we prove that generically purely singular continuous spectrum occurs