  Using Floquet theory, we investigate the effect of light on triple fold
fermions. We study a low energy model as well as a simplified tight binding
model under illumination. We find that the three fold degeneracy remains
symmetry protected even after applying light if the original band structure is
rotationally symmetric around the degeneracy. Otherwise, light can lift the
degeneracy and open up a gap. We further investigate the effect of light on the
topological Fermi arcs by means of numerical computations. The changes caused
by illumination are reflected in experimentally detectable signatures, such as
the anomalous Hall conductivity, which we calculate.
