Scattering peculiarities of Weyl semimetal rotationally symmetric spherical particles

Abstract

Weyl semimetals are prospective topological materials, in which conduction and valence bands touch each other in a discrete number of points. This opens up prominent electronic properties of Weyl semimetals and noticeably influences light-matter interaction. In this work, we study the light scattering by a spherical particle with a radially oriented gyrotropy axis inspired by the Weyl semimetal response. Using the operator scattering theory, we represent the transfer matrix of the gyrotropic spherical layer as a product of matrix exponentials, which allows us to calculate the wavelength-dependent scattering efficiency and analyze the multipole structure of the observed resonances. We demonstrate the change of the scattering pattern upon polarization ellipse deformation for considered Weyl semimetal scatterers and reveal the scattering peculiarities of multilayer Weyl semimetal particles with alternating orientation of the gyrotropy axis. In this research, we pave the way for designing polarization-sensitive nanophotonic devices.