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

Authors :
Cuerda, Javier
Taskinen, Jani M.
Källman, Nicki
Grabitz, Leo
Törmä, Päivi
Publication Year :
2023

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 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.

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....3fab77e6917a086062ddaf60126aa86b