Experimental observation of bulk Fermi arc in single dielectric resonator
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915158072229888 |
|---|---|
| author | Solodovchenko, N. Zhang, F. Bochkarev, M. Samusev, K. Song, M. Bogdanov, A. Limonov, M. |
| author_facet | Solodovchenko, N. Zhang, F. Bochkarev, M. Samusev, K. Song, M. Bogdanov, A. Limonov, M. |
| contents | The bulk Fermi arc is a fundamental non-Hermitian topological feature that connects two exceptional points (EPs), featuring the transition between Hermitian and non-Hermitian worlds. The bulk Fermi arc emerges when losses are introduced into a Hermitian system, causing a Dirac point to split into two EPs, where both the eigenvalues and eigenfunctions coalesce. Although theoretically predicted in various systems, experimental confirmation has been limited to a two-dimensional photonic crystal slab. Here, we present the first experimental observation of a bulk Fermi arc in a single dielectric resonator. Specifically, we consider a ring resonator made of high-refractive index ceramic. The inner radius and height are varied, enabling the observation of a two-sheeted Riemann surface with two EPs connected by a bulk Fermi arc, confirmed through numerical calculations and experimentally measured extinction spectra at GHz frequencies. These results establish dielectric resonators as a powerful platform for investigating non-Hermitian topological physics and open new avenues for designing topologically robust photonic devices and EP-based sensors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_12711 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental observation of bulk Fermi arc in single dielectric resonator Solodovchenko, N. Zhang, F. Bochkarev, M. Samusev, K. Song, M. Bogdanov, A. Limonov, M. Optics The bulk Fermi arc is a fundamental non-Hermitian topological feature that connects two exceptional points (EPs), featuring the transition between Hermitian and non-Hermitian worlds. The bulk Fermi arc emerges when losses are introduced into a Hermitian system, causing a Dirac point to split into two EPs, where both the eigenvalues and eigenfunctions coalesce. Although theoretically predicted in various systems, experimental confirmation has been limited to a two-dimensional photonic crystal slab. Here, we present the first experimental observation of a bulk Fermi arc in a single dielectric resonator. Specifically, we consider a ring resonator made of high-refractive index ceramic. The inner radius and height are varied, enabling the observation of a two-sheeted Riemann surface with two EPs connected by a bulk Fermi arc, confirmed through numerical calculations and experimentally measured extinction spectra at GHz frequencies. These results establish dielectric resonators as a powerful platform for investigating non-Hermitian topological physics and open new avenues for designing topologically robust photonic devices and EP-based sensors. |
| title | Experimental observation of bulk Fermi arc in single dielectric resonator |
| topic | Optics |
| url | https://arxiv.org/abs/2502.12711 |