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

Autor:	Cuerda, Javier, Taskinen, Jani M., Källman, Nicki, Grabitz, Leo, Törmä, Päivi
Rok vydání:	2023
Předmět:	Physics - Optics Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Physical Review Research 6, L022020 (2024)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevResearch.6.L022020
Popis:	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. Comment: Revised version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2305.13174 Zobrazit plný text záznamu View this record from Arxiv