Observation of Quantum metric and non-Hermitian Berry curvature in a plasmonic lattice
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866916256072859648 |
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| author | Cuerda, Javier Taskinen, Jani M. Källman, Nicki Grabitz, Leo Törmä, Päivi |
| author_facet | Cuerda, Javier Taskinen, Jani M. Källman, Nicki Grabitz, Leo Törmä, Päivi |
| contents | We experimentally observe the quantum geometric tensor, namely the quantum metric and the Berry curvature, for a square lattice of radiatively coupled plasmonic nanoparticles. We observe a non-zero Berry curvature and show that it arises solely from non-Hermitian effects. The quantum metric is found to originate from a pseudospin-orbit coupling. The long-range nature of the radiative interaction renders the behavior distinct from tight-binding systems: Berry curvature and quantum metric are centered around high-symmetry lines of the Brillouin zone instead of high-symmetry points. Our results inspire new pathways in the design of topological systems by tailoring losses or gain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_13174 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of Quantum metric and non-Hermitian Berry curvature in a plasmonic lattice Cuerda, Javier Taskinen, Jani M. Källman, Nicki Grabitz, Leo Törmä, Päivi Optics Mesoscale and Nanoscale Physics We experimentally observe the quantum geometric tensor, namely the quantum metric and the Berry curvature, for a square lattice of radiatively coupled plasmonic nanoparticles. We observe a non-zero Berry curvature and show that it arises solely from non-Hermitian effects. The quantum metric is found to originate from a pseudospin-orbit coupling. The long-range nature of the radiative interaction renders the behavior distinct from tight-binding systems: Berry curvature and quantum metric are centered around high-symmetry lines of the Brillouin zone instead of high-symmetry points. Our results inspire new pathways in the design of topological systems by tailoring losses or gain. |
| title | Observation of Quantum metric and non-Hermitian Berry curvature in a plasmonic lattice |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2305.13174 |