Wave Packet Dynamics, Ergodicity, and Localization in Quasiperiodic Chains

Abstract

In this paper, we report results for the wave packet dynamics in a class of quasiperiodic chains consisting of two types of weakly coupled clusters. The dynamics are studied by means of the return probability and the mean square displacement. The wave packets show anomalous diffusion in a stepwise process of fast expansion followed by time intervals of confined wave packet width. Applying perturbation theory, where the coupling parameter v is treated as perturbation, the properties of the eigenstates of the system are investigated and related to the structure of the chains. The results show the appearance of non-localized states only in sufficiently high orders of the perturbation expansions. Further, we compare these results to the exact solutions obtained by numerical diagonalization. This shows that eigenstates spread across the entire chain for v>0, while in the limit v->0 ergodicity is broken and eigenstates only spread across clusters of the same type, in contradistinction to trivial localization for v=0. Caused by this ergodicity breaking, the wave packet dynamics change significantly in the presence of an impurity offering the possibility to control its long-term dynamics.

10 pages, 9 figures

References in corpus (4)

• Anomalous transport: a mathematical framework
• Electronic transport properties of quasicrystals: a Review
• Energy spectra, wavefunctions and quantum diffusion for quasiperiodic systems
• Spectral and Diffusive Properties of Silver-Mean Quasicrystals in 1,2, and 3 Dimensions

Cited by in corpus (11)

• Fraction of delocalized eigenstates in the long-range Aubry-André-Harper model
• Many-body localization in a quasiperiodic Fibonacci chain
• Diffusive transport in a quasiperiodic Fibonacci chain: absence of many-body localization at small interactions
• Renormalization Group Approach for the Wave Packet Dynamics in Golden-Mean and Silver-Mean Labyrinth Tilings
• Wave Functions, Quantum Diffusion, and Scaling Exponents in Golden-Mean Quasiperiodic Tilings
• Photonic Properties of Metallic-Mean Quasiperiodic Chains
• Observation of Log-Periodic Oscillations in the Quantum Dynamics of Electrons on the One-Dimensional Fibonacci Quasicrystal
• The Fibonacci quasicrystal: case study of hidden dimensions and multifractality
• Engineering insulator-metal transition in a class of decorated aperiodic lattices: a quantum dynamical study
• The band-gap structures and recovery rules of generalized n-component Fibonacci piezoelectric superlattices
• Superconducting order parameter in aperiodic binary systems