Tunable interface states between Floquet-Weyl semimetals

Weyl semimetals and nodal line semimetals are characterized by linear electronic bands touching at zero-dimensional points and one-dimensional lines, respectively. Recently, it has been predicted that nodal line semimetals can be driven into tunable Floquet-Weyl semimetals by circularly polarized light. Here we study the occurrence of interface states between two regions of a nodal line semimetal illuminated by two beams of light with opposite circular polarizations. Within a minimal model we find remarkable modifications of the energy structure by tuning the polarized light, such as the possible generation of Van Hove singularities. Moreover, by adding a $\ensuremath{\delta}$ doping of magnetic impurities along the interfacial plane, we show the occurrence of a switchable and topologically nontrivial, vortexlike pseudospin pattern of the interface states.