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Single phonon excitations are sensitive probes of light dark matter in thekeV-GeV mass window. For anisotropic target materials, the signal depends onthe direction of the incoming dark matter wind and exhibits a daily modulation.We discuss in detail the various sources of anisotropy, and carry out acomparative study of 26 crystal targets, focused on sub-MeV dark matterbenchmarks. We compute the modulation reach for the most promising targets,corresponding to the cross section where the daily modulation can be observedfor a given exposure, which allows us to combine the strength of DM-phononcouplings and the amplitude of daily modulation. We highlight Al$_2$O$_3$(sapphire), CaWO$_4$ and h-BN (hexagonal boron nitride) as the best polarmaterials for recovering a daily modulation signal, which feature$\mathcal{O}(1 - 100)\%$ variations of detection rates throughout the day,depending on the dark matter mass and interaction. The directional nature ofsingle phonon excitations offers a useful handle to mitigate backgrounds, whichis crucial for fully realizing the discovery potential of near futureexperiments.

Directional Detectability of Dark Matter With Single Phonon Excitations: Target Comparison