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

Javier Cuerda, Jani M. Taskinen, Nicki Källman, Leo Grabitz, Päivi Törmä

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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.
Original languageEnglish
Article numberL022020
JournalPHYSICAL REVIEW RESEARCH
Volume6
Issue number2
DOIs
Publication statusPublished - 25 Apr 2024
MoE publication typeA1 Journal article-refereed

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