Anisotropic non-Hermitian skin effect in a two-dimensional Lieb photonic crystal
Optics
2026-05-19 v2 Other Condensed Matter
Abstract
In this contribution paper, we construct a two-dimensional non-Hermitian (NH) photonic crystal (PhC) to prototype its anisotropic non-Hermitian skin effect (NHSE) for experimental proposal. Based on the tight-binding model for Lieb lattice with NH coupling, a nontrivial spectral winding number is pinpointed for certain eigenstates, which translates to geometry-dependent skin modes with tilt boundaries. For ease of implementation, complex refractive indices are employed for the Lieb unit cell of PhC to emulate the NH coupling. Validated by full wave simulation, our work underscores the boundary dependence of skin effect, and provides a concrete prototype design of NHSE implementable by state-of-the-art of topological metamaterial platforms.
Keywords
Cite
@article{arxiv.2603.19932,
title = {Anisotropic non-Hermitian skin effect in a two-dimensional Lieb photonic crystal},
author = {Zhi-Kang Xiong and Tianlei Wen and Y. Liu and Hai Lin and Bin Zhou},
journal= {arXiv preprint arXiv:2603.19932},
year = {2026}
}