Dirac plasmons in bipartite lattices of metallic nanoparticles
arXiv:1411.7796 · doi:10.1088/2053-1583/2/1/014008
Abstract
We study theoretically "graphene-like" plasmonic metamaterials constituted by two-dimensional arrays of metallic nanoparticles, including perfect honeycomb structures with and without inversion symmetry, as well as generic bipartite lattices. The dipolar interactions between localised surface plasmons in different nanoparticles gives rise to collective plasmons that extend over the whole lattice. We study the band structure of collective plasmons and unveil its tunability with the orientation of the dipole moments associated with the localised surface plasmons. Depending on the dipole orientation, we identify a phase diagram of gapless or gapped phases in the collective plasmon dispersion. We show that the gapless phases in the phase diagram are characterised by collective plasmons behaving as massless chiral Dirac particles, in analogy with electrons in graphene. When the inversion symmetry of the honeycomb structure is broken, collective plasmons are described as gapped chiral Dirac modes with an energy-dependent Berry phase. We further relax the geometric symmetry of the honeycomb structure by analysing generic bipartite hexagonal lattices. In this case we study the evolution of the phase diagram and unveil the emergence of a sequence of topological phase transitions when one hexagonal sublattice is progressively shifted with respect to the other.
arXiv comment20 pages, 10 figures, 3 videos; published version (2D Materials, focus on artificial graphene)
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Cited by in corpus (7)
- Topological collective plasmons in bipartite chains of metallic nanoparticles
- Topological phases of polaritons in a cavity waveguide
- Quantum metamaterials in the microwave and optical ranges
- Nonradiative limitations to plasmon propagation in chains of metallic nanoparticles
- Plasmon polaritons in cubic lattices of spherical metallic nanoparticles
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