engleski

Surface plasmons in Dirac/Weyl semimetals

Three-dimensional topological Dirac/Weyl semimetals, which can be seen as the three-dimensional analogs of graphene, have been intensively studied recently. The dielectric formalism within the random phase approximation (RPA) gives a bulk plasmon mode which is responsible for the appearance of a well-defined surface plasmon mode in the structure factor. The obtained surface plasmon dispersion always stays below the bulk plasmon dispersion. In addition, Weyl semimetals comprise surface Fermi arc electron states which result with an anisotropic Fermi arc plasmon mode. We study the modification of the surface plasmon mode due to the Fermi arc plasmon mode using the dielectric formalism and the Bogoliubov transformation technique for a model Hamiltonian. The obtained results for the surface plasmon mode are consistent with the recent experimental data in these materials.

Weyl semimetal ; Surface plasmon ; Fermi arc plasmon

nije evidentirano