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

References in corpus (20)

• Topological Photonics
• Scheme to Achieve Silicon Topological Photonics
• Analogs of quantum Hall effect edge states in photonic crystals
• Edge Modes, Degeneracies, and Topological Numbers in Non-Hermitian Systems
• Non-Hermitian Topology and Exceptional-Point Geometries
• Weyl Exceptional Rings in a Three-Dimensional Dissipative Cold Atomic Gas
• Non-Hermitian topological phenomena: A review
• Superfluidity and Quantum Geometry in Twisted Multilayer Systems
• Active topological photonics
• Band geometry, Berry curvature and superfluid weight
• Dirac-like plasmons in honeycomb lattices of metallic nanoparticles
• Topological Polarization Singularities in Metaphotonics
• Exceptional Topological Insulators
• Experimental measurement of the divergent quantum metric of an exceptional point
• Non-Hermitian Photonic Lattices: tutorial
• Quantum metric and wavepackets at exceptional points in non-Hermitian systems
• Magnetoplasmonics: current challenges and future opportunities
• Extracting the Quantum Geometric Tensor of an Optical Raman Lattice by Bloch State Tomography
• Pseudospin-orbit coupling and non-Hermitian effects in the Quantum Geometric Tensor of a plasmonic lattice
• Polarization and phase textures in lattice plasmon condensates

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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