Observation of quantum metric and non-Hermitian Berry curvature in a plasmonic lattice
Loading...
Access rights
openAccess
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
View publication in the Research portal
View/Open full text file from the Research portal
Other link related to publication
Date
2024-04-25
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
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.Description
Keywords
Other note
Citation
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
