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

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.

Revised version

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Cited by in corpus (18)

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• Generalized Quantum Geometric Tensor in a Non-Hermitian Exciton-Polariton System
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• Local geometry and quantum geometric tensor of mixed states
• Pseudospin-orbit coupling and non-Hermitian effects in the Quantum Geometric Tensor of a plasmonic lattice
• Sj$\ddot{\text{o}}$qvist quantum geometric tensor of finite-temperature mixed states
• Quantum geometry of bosonic Bogoliubov quasiparticles
• Finite steady-state current defies non-Hermitian many-body localization
• Topological invariants and topological charges in photonic systems
• Quantum geometrical effects in non-Hermitian systems
• Breakdown of Bulk-Radiation Correspondence in Radiative Photonic Lattices
• Direct measurement of the quantum geometric tensor in pseudo-Hermitian systems
• Topological photonics in nanoscaled systems with far field radiation and polarization singularities
• Dynamics of "Classical" Bosons, Fermions, and beyond
• Flat band mediated photon-photon interactions in 2D waveguide QED networks
• Scaling of Quantum Geometry Near the Non-Hermitian Topological Phase Transitions
• Screened topological plasmons in graphene plasmonic crystals