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High-energy photons with $\mathcal{O}$(MeV) energies from radioactivecontaminants can scatter in a solid-state target material and constitute animportant low-energy background for sub-GeV dark matter direct-detectionsearches. This background is most noticeable for energy deposits in the $1 -100$ meV range due to the partially coherent scattering enhancement in theforward scattering direction. We comprehensively quantify the resulting single-and multi-phonon background in Si, Ge, GaAs, SiC, and Al$_2$O$_3$ targetmaterials, which are representative of target materials of interest in low-massdark matter searches. We use a realistic representation of the high-energyphoton background, and contrast the expected background phonon spectrum withthe expected dark matter signal phonon spectrum. An active veto is needed tosuppress this background sufficiently in order to allow for the detection of adark matter signal, even in well-shielded environments. For comparison we alsoshow the expected single- and multi-phonon event rates from coherentneutrino-nucleus scattering due to solar neutrinos, and find that they aresub-dominant to the photon-induced phonon background.

The Phonon Background from Gamma Rays in Sub-GeV Dark Matter Detectors