2014/11/30 by Thomas Jebb Sturges, Claire Woollacott, Guillaume Weick +1
Materials Science · Physics and Astronomy · #Dipole #Dirac (video compression format) #Gapless playback #Graphene research and applications #Massless particle #Metamaterial #Metamaterials and Metasurfaces Applications #Phase diagram #Plasmon #Quasiparticle #Surface plasmon #Topological Materials and Phenomena #cond-mat.mes-hall #physics.optics
paper · pdf · doi:10.1088/2053-1583/2/1/014008
published as 2D Mater. 2, 014008 (2015) · 20 pages, 10 figures, 3 videos; published version (2D Materials, focus on artificial graphene)
openalex publication_date 2015/02/12 · arxiv created 2015/02/13 · arxiv updated 2015/02/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 localized surface plasmons (LSPs) in different nanoparticles gives rise to collective plasmons (CPs) that extend over the whole lattice. We study the band structure of CPs and unveil its tunability with the orientation of the dipole moments associated with the LSPs. Depending on the dipole orientation, we identify a phase diagram of gapless or gapped phases in the CP dispersion. We show that the gapless phases in the phase diagram are characterized by CPs behaving as massless chiral Dirac particles, in analogy with electrons in graphene. When the inversion symmetry of the honeycomb structure is broken, CPs 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.