Tunable caging of excitation in decorated Lieb-ladder geometry with long range connectivity

TL;DR

This paper demonstrates tunable Aharonov-Bohm caging in a decorated Lieb-ladder structure with long-range connectivity, enabling control over wave confinement through magnetic flux modulation within a tight-binding framework.

Contribution

It introduces a new quasi-one-dimensional Lieb-ladder model with long-range hopping and fractal geometries, providing an exact analytical approach for tunable wave confinement.

Findings

Exotic eigenspectrum with flat band states observed.

Magnetic flux modulation controls non-resonant modes.

Exact real space renormalization group method developed.

Abstract

Controlled Aharonov-Bohm caging of wave train is reported in a quasi-one dimensional version of Lieb geometry with next nearest neighbor hopping integral within the tight-binding framework. This longer wavelength fluctuation is considered by incorporating periodic, quasi-periodic or fractal kind of geometry inside the skeleton of the original network. This invites exotic eigenspectrum displaying a distribution of flat band states. Also a subtle modulation of external magnetic flux leads to a comprehensive control over those non-resonant modes. Real space renormalization group method provides us an exact analytical prescription for the study of such tunable imprisonment of excitation. The non-trivial tunability of external agent is important as well as challenging in the context of experimental perspective.