Frequency-dependent Faraday and Kerr rotation in anisotropic nonsymmorphic Dirac semimetals

We calculate the frequency-dependent longitudinal and Hall conductivities Faraday Kerr rotation angles for a single sheet of anisotropic Dirac semimetal protected by nonsymmorphic symmetry in presence Zeeman term coupling to out-of-plane component spin. While causes plane polarization light, anisotropy appearance an elliptically polarized initially linearly beam. The two effects can be combined complex angle. At zero-frequency limit, we find finite value angle, which is given $2\alpha_F$, where $\alpha_F$ effective fine structure constant associated with velocity dispersing fermions. also logarithmic enhancement (and Kerr) as frequency light approaches absorption edge Zeeman-induced gap. reduced impurity scattering, it remains significant attainable level material purity. These results indicate that two-dimensional materials are responsive couplings used platforms magneto-optic applications, such realization polarization-rotating devices.