THz Vortex Light and Landau Level Transitions in Topological Semimetals

Abstract

A THz vortex beam describes light with a larger than ordinary total angular momentum. Increased total angular momentum modifies the optical selection rules, opening a new territory of material research. We discuss the basic concept of vortex beams and a possible approach for future THz studies. The experiments on Landau level transitions will be given as an example.