Observation of quantum metric and non-Hermitian Berry curvature in a plasmonic lattice

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-04-25
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en
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PHYSICAL REVIEW RESEARCH, Volume 6
Abstract
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 nonzero 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 pathways in the design of topological systems by tailoring losses or gain.
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Cuerda, J, Taskinen, J M, Källman, N, Grabitz, L & Törmä, P 2024, ' Observation of quantum metric and non-Hermitian Berry curvature in a plasmonic lattice ', PHYSICAL REVIEW RESEARCH, vol. 6, no. 2, L022020 . https://doi.org/10.1103/PhysRevResearch.6.L022020