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  • Letter
  • Open Access

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

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

  • Department of Applied Physics, Aalto University School of Science, Aalto FI-00076, Finland

  • *javier.cuerda@aalto.fi
  • †paivi.torma@aalto.fi
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Phys. Rev. Research 6, L022020 – Published 25 April, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L022020

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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Pseudospin-orbit coupling and non-Hermitian effects in the quantum geometric tensor of a plasmonic lattice

Javier Cuerda, Jani M. Taskinen, Nicki Källman, Leo Grabitz, and Päivi Törmä
Phys. Rev. B 109, 165439 (2024)

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Phys. Rev. Research 6, L022020– Published 25 April, 2024
  • Received 24 May 2023
  • Accepted 25 March 2024
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