2019/09/02 by Qianfan Chen, Maria Erukhimova, Mikhail Tokman +2
Computer Science · Engineering · Mathematics · Physics and Astronomy · #Band gap #Condensed matter physics #Electrical resistivity and conductivity #Geometry #Hall effect #Materials science #Mathematics #Physics #Plasmonic and Surface Plasmon Research #Polariton #Quantum Information and Cryptography #Quantum mechanics #Semimetal #Surface (topology) #Topological Materials and Phenomena #cond-mat.mes-hall #physics.optics
paper · pdf · doi:10.1103/physrevb.100.235451
published as Phys. Rev. B 100, 235451 (2019)
arxiv created 2019/09/02 · openalex created_date 2019/09/12 · openalex publication_date 2019/12/26 · arxiv updated 2020/01/01 · openalex updated_date 2026/08/05
Weyl semimetals possess unique electrodynamic properties due to a combination of strongly anisotropic and gyrotropic bulk conductivity, surface conductivity, and surface dipole layer. In particular, the gyrotropy caused by Weyl node separation in momentum space gives rise to the optical Hall effect for surface polaritons at the boundaries parallel to the gyrotropic axis. We explore the potential of popular tip-enhanced optical spectroscopy techniques for studies of bulk and surface topological electron states in these materials. Strong anisotropy, anomalous dispersion, and the optical Hall effect for surface polaritons launched by a nanotip provide information about Weyl node position and separation in the Brillouin zone, the value of the Fermi momentum, and the matrix elements of the optical transitions involving both bulk and surface electron states.