Hybridization of Non-Hermitian Topological Interface Modes
Abstract
We propose and experimentally demonstrate the hybridization of radiating topological interface states, analogous to Jackiw-Rebbi states but in gain media with radiation fields. This hybridization not only modifies energy levels under a strong coupling scheme but also significantly reshapes far-field radiation characteristics. The bonding mode exhibits sub-radiant, omnidirectional emission, while the antibonding mode becomes super-radiant and highly unidirectional. Crucially, this non-Hermitian hybridization is tunable, allowing simultaneous control of energy splitting, quality factor, and far-field radiation by varying the distance between the two topological interfaces. Our findings establish hybridized radiating topological interface states as a robust platform for engineering two-level systems with tailored far-field responses, offering new possibilities for applications in beam shaping, nonlinear optics, quantum technologies, and beyond.
Cite
@article{arxiv.2502.17649,
title = {Hybridization of Non-Hermitian Topological Interface Modes},
author = {Yuhao Wang and Hai-Chau Nguyen and Zhiyi Yuan and T. Thu Ha Do and Vytautas Valuckas and Hai Son Nguyen and Cuong Dang and Son Tung Ha},
journal= {arXiv preprint arXiv:2502.17649},
year = {2025}
}