  We investigate the velocity and recoil momentum dependence of dark matter
interactions with ordinary matter. In particular we focus on the
single-electron resolution semiconductor detectors, which allow experimental
assessment of sub-GeV dark matter masses. We find that, within a specific mass
range depending on the detector material, the dark matter interactions result
in a signal characterized by daily modulation. Furthermore, we find that the
detailed structure of this modulation is sensitive to the velocity and momentum
dependence of dark matter interactions. We identify the optimal mass range for
the prevalence of these effects.
