Dirac Spectra and Edge States in Honeycomb Plasmonic Lattices

Details Dirac Spectra and Edge States in Honeycomb Plasmonic Lattices Dirac Spectra and Edge States in Honeycomb Plasmonic Lattices

2008-10-23

arxiv.org/abs/0810.4200v1

Phys. Rev. Lett. 102, 123904 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.123904

We study theoretically the dispersion of plasmonic honeycomb lattices and find Dirac spectra for both dipole and quadrupole modes. Zigzag edge states derived from Dirac points are found in ribbons of these honeycomb plasmonic lattices. The zigzag edge states for out-of-plane dipole modes are closely analogous to the electronic ones in graphene nanoribbons. The edge states for in-plane dipole modes and quadrupole modes, however, have rather unique characters due to the vector nature of the plasmonic excitations. The conditions for the existence of plasmonic edge states are derived analytically.

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