Projects per year
Abstract
We theoretically predict the full quantum geometric tensor, comprising the quantum metric and the Berry curvature, for a square lattice of plasmonic nanoparticles. The gold nanoparticles act as dipole or multipole antenna radiatively coupled over long distances. The photonicplasmonic eigenfunctions and energies of the system depend on momentum and polarization (pseudospin), and their topological properties are encoded in the quantum geometric tensor. By Tmatrix numerical simulations, we identify a TETM band splitting at the diagonals of the first Brillouin zone, that is not predicted by the empty lattice band structure nor by the highly symmetric nature of the system. Further, we find quantum metric around these regions of the reciprocal space, and even a nonzero Berry curvature despite the trivial lattice geometry and absence of magnetic field. We show that this nonzero Berry curvature arises exclusively from nonHermitian effects, which break the timereversal symmetry. The quantum metric, in contrast, originates from a pseudospinorbit coupling given by the polarization and directional dependence of the radiation.
Original language  English 

Article number  165439 
Journal  Physical Review B 
Volume  109 
Issue number  16 
DOIs  
Publication status  Published  25 Apr 2024 
MoE publication type  A1 Journal articlerefereed 
Fingerprint
Dive into the research topics of 'Pseudospinorbit coupling and nonHermitian effects in the quantum geometric tensor of a plasmonic lattice'. Together they form a unique fingerprint.
: Correlations in multiband quantum systems
Törmä, P., Arjas, K., Dahlberg, A., HeilmannRämö, R., Penttilä, R., Yıldırım, P., Taskinen, J., Hu, L., Aronen, K. & Rintala, L.
01/09/2022 → 31/08/2026
Project: Academy of Finland: Other research funding

SPATUNANO: SpatioTemporal Theory for Tunable Nanoscale Coherent light source
01/09/2019 → 31/12/2022
Project: Academy of Finland: Other research funding

PREIN: Photonics Research and Innovation
01/01/2019 → 31/12/2022
Project: Academy of Finland: Other research funding