Topology and criticality in non-Hermitian multimodal optical resonators through engineered losses

• URL: http://arxiv.org/abs/2509.05163v1
• Date: Fri, 05 Sep 2025 14:57:46 GMT
• Title: Topology and criticality in non-Hermitian multimodal optical resonators through engineered losses
• Authors: Elizabeth Louis Pereira, Hongwei Li, Andrea Blanco-Redondo, Jose L. Lado,
• Abstract summary: Non-Hermitian topological matter provides a platform for engineering phenomena that go beyond the capabilities of Hermitian systems.<n>We show that multimodal non-Hermitian lattices featuring multiple resonant modes are capable of featuring topological modes and criticality.<n>Our results demonstrate that internal orbital degrees of freedom provide a promising strategy to engineer controllable non-Hermitian topology and criticality.
• Score: 3.445121580443951
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Hermitian topological matter provides a platform for engineering phenomena that go beyond the capabilities of Hermitian systems, enabling the use of losses to engineer topological phenomena. Non-Hermitian models often rely on artificial platforms made of engineered lattices because controlling losses in natural compounds is challenging. Although typical models for non-Hermitian photonic matter are often single mode, photonic systems are often multimodal, producing mixing between different normal modes in each site. In this work, we explore a generalized family of multimodal non-Hermitian lattices, featuring multiple resonant modes. We show that these multimodal models are capable of featuring topological modes and criticality, similar to the artificial single-mode models often considered. We analyze the robustness of these non-Hermitian topological modes to fluctuation of local losses, disorder, and artificial gauge field. We show that these effects can be captured via both a full microscopic model and effective multiorbital models. Specifically, we show that due to their multiorbital nature, the localization properties of non-Hermitian multiorbital models can be controlled by an external gauge field. Our results demonstrate that internal orbital degrees of freedom provide a promising strategy to engineer controllable non-Hermitian topology and criticality.

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