Topological states in disordered arrays of dielectric nanoparticles

Abstract

We study the interplay between disorder and topology for the localized edge states of light in topological zigzag arrays of resonant dielectric nanoparticles. We characterize topological properties by the winding number that depends on both zigzag angle and spacing between nanoparticles in the array. For equal-spacing arrays, the system may have two values of the winding number $\nu =0$ or $1$, and it demonstrates localization at the edges even in the presence of disorder, being consistent with experimental observations for finite-length nanodisk structures. For staggered-spacing arrays, the system possesses richer topological phases characterized by the winding numbers $\nu =0$, $1$ or $2$, which depend on the averaged zigzag angle and disorder strength. In a sharp contrast to the equal-spacing zigzag arrays, staggered-spacing arrays reveal two types of topological phase transitions induced by the angle disorder, (i) $\nu =0\leftrightarrow \nu =1$ and (ii) $\nu =1\leftrightarrow \nu =2$. More importantly, the spectrum of staggered-spacing arrays may remain gapped even in the case of a strong disorder.

10 pages, 10 figures

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Cited by in corpus (6)

• A brief review of topological photonics in one, two, and three dimensions
• Real-space representation of winding number for one-dimensional chiral-symmetric topological insulator
• Probing the Topological Anderson Transition in Quasiperiodic Photonic Lattices via Chiral Displacement and Wavelength Tuning
• Multiple polaritonic edge states in a Su-Schrieffer-Heeger chain strongly coupled to a multimode cavity
• Topological Photonics on a Small Scale
• Anomalous Non-Hermitian Topological Anderson Insulator