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

TL;DR

This paper investigates how electronic transmission resonances in quasiperiodic $ ext{delta}$-function potentials exhibit multifractal scaling behavior as system size varies, revealing the impact of imperfections on electronic states.

Contribution

It provides a detailed multifractal analysis of transmission resonances in perfect and imperfect Fibonacci $ ext{delta}$-function potentials, highlighting the effects of small perturbations.

Findings

Transmission resonances become more fragmented with increasing system size.

Imperfect systems show altered critical states compared to perfect ones.

Multifractal scaling effectively characterizes the size-dependent behavior of resonances.

Abstract

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.