2016/02/29 by Oleg V. Kotov, Yu. E. Lozovik, Yurii E. Lozovik · 1 citation
Materials Science · Physics and Astronomy · #Band gap #Band-pass filter #Condensed matter physics #Dielectric #Electromagnetic radiation #Graphene #Graphene research and applications #Materials science #Metamaterials and Metasurfaces Applications #Nanotechnology #Optics #Optoelectronics #Passband #Permittivity #Physics #Plasmon #Polariton #Semimetal #Surface plasmon #Surface plasmon polariton #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.93.235417
published as Phys. Rev. B 93, 235417 (2016) · 12 pages, 8 figures
arxiv created 2016/06/10 · arxiv updated 2016/06/13 · openalex publication_date 2016/06/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Using the Kubo formalism we have calculated the local dynamic conductivity of a bulk, i.e., three-dimensional (3D), Dirac semimetal (BDS). We obtain that at frequencies lower than Fermi energy the metallic response in a BDS film manifests in the existence of surface-plasmon polaritons, but at higher frequencies the dielectric response is dominated and it occurs that a BDS film behaves as a dielectric waveguide. At this dielectric regime we predict the existence inside a BDS film of novel electromagnetic modes, a 3D analog of the transverse electric waves in graphene. We also find that the dielectric response manifests as the wide-angle passband in the mid-infrared (IR) transmission spectrum of light incident on a BDS film, which can be used for the interferenceless omnidirectional mid-IR filtering. The tuning of the Fermi level of the system allows us to switch between the metallic and the dielectric regimes and to change the frequency range of the predicted modes. This makes BDSs promising materials for photonics and plasmonics.